diff mbox

[v2,1/2] clk: change clk_ops' ->round_rate() prototype

Message ID 1430407809-31147-2-git-send-email-boris.brezillon@free-electrons.com (mailing list archive)
State Not Applicable, archived
Headers

Commit Message

Boris BREZILLON April 30, 2015, 3:30 p.m. UTC 
  Clock rates are stored in an unsigned long field, but ->round_rate()
(which returns a rounded rate from a requested one) returns a long
value (errors are reported using negative error codes), which can lead
to long overflow if the clock rate exceed 2Ghz.

Change ->round_rate() prototype to return 0 or an error code, and pass the
requested rate as a pointer so that it can be adjusted depending on
hardware capabilities.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mikko Perttunen <mikko.perttunen@kapsi.fi>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
CC: Jonathan Corbet <corbet@lwn.net>
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CC: Sylwester Nawrocki <s.nawrocki@samsung.com> 
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 Documentation/clk.txt                        |  4 +-
 arch/arm/mach-imx/clk-busy.c                 |  2 +-
 arch/arm/mach-imx/clk-cpu.c                  | 12 +++-
 arch/arm/mach-imx/clk-fixup-div.c            |  2 +-
 arch/arm/mach-imx/clk-pfd.c                  | 11 ++--
 arch/arm/mach-imx/clk-pllv2.c                |  8 ++-
 arch/arm/mach-imx/clk-pllv3.c                | 46 +++++++------
 arch/arm/mach-msm/clock-pcom.c               |  4 +-
 arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c | 13 ++--
 arch/arm/mach-omap2/clkt_clksel.c            |  6 +-
 arch/arm/mach-omap2/clkt_dpll.c              | 21 +++---
 arch/arm/mach-omap2/clock.h                  |  4 +-
 arch/arm/mach-omap2/dpll3xxx.c               | 27 +++++---
 arch/arm/mach-omap2/dpll44xx.c               | 26 +++++---
 arch/arm/mach-vexpress/spc.c                 | 11 +++-
 arch/mips/alchemy/common/clock.c             | 13 ++--
 drivers/clk/at91/clk-h32mx.c                 | 24 ++++---
 drivers/clk/at91/clk-peripheral.c            | 31 +++++----
 drivers/clk/at91/clk-pll.c                   | 14 ++--
 drivers/clk/at91/clk-plldiv.c                | 22 ++++---
 drivers/clk/at91/clk-smd.c                   | 24 ++++---
 drivers/clk/at91/clk-usb.c                   | 16 +++--
 drivers/clk/clk-axi-clkgen.c                 |  5 +-
 drivers/clk/clk-cdce706.c                    | 46 ++++++-------
 drivers/clk/clk-composite.c                  | 23 ++++---
 drivers/clk/clk-divider.c                    | 16 +++--
 drivers/clk/clk-fixed-factor.c               |  7 +-
 drivers/clk/clk-fractional-divider.c         | 16 +++--
 drivers/clk/clk-highbank.c                   | 18 +++---
 drivers/clk/clk-si5351.c                     | 96 ++++++++++++++--------------
 drivers/clk/clk-si570.c                      | 14 ++--
 drivers/clk/clk-u300.c                       | 65 ++++++++++---------
 drivers/clk/clk-vt8500.c                     | 27 ++++----
 drivers/clk/clk-wm831x.c                     | 11 ++--
 drivers/clk/clk-xgene.c                      | 11 ++--
 drivers/clk/clk.c                            | 14 ++--
 drivers/clk/mmp/clk-frac.c                   | 14 ++--
 drivers/clk/mvebu/clk-corediv.c              |  7 +-
 drivers/clk/mvebu/clk-cpu.c                  |  9 +--
 drivers/clk/mxs/clk-div.c                    |  4 +-
 drivers/clk/mxs/clk-frac.c                   | 11 ++--
 drivers/clk/mxs/clk-ref.c                    | 11 ++--
 drivers/clk/qcom/clk-regmap-divider.c        |  4 +-
 drivers/clk/rockchip/clk-pll.c               | 13 ++--
 drivers/clk/samsung/clk-pll.c                | 13 ++--
 drivers/clk/shmobile/clk-div6.c              |  7 +-
 drivers/clk/shmobile/clk-rcar-gen2.c         |  9 +--
 drivers/clk/sirf/clk-common.c                | 18 +++---
 drivers/clk/spear/clk-aux-synth.c            | 10 ++-
 drivers/clk/spear/clk-frac-synth.c           | 10 ++-
 drivers/clk/spear/clk-gpt-synth.c            | 10 ++-
 drivers/clk/spear/clk-vco-pll.c              | 20 ++++--
 drivers/clk/st/clk-flexgen.c                 | 11 ++--
 drivers/clk/st/clkgen-fsyn.c                 | 21 +++---
 drivers/clk/st/clkgen-mux.c                  |  2 +-
 drivers/clk/sunxi/clk-factors.c              | 14 ++--
 drivers/clk/tegra/clk-audio-sync.c           |  8 +--
 drivers/clk/tegra/clk-divider.c              | 19 ++++--
 drivers/clk/tegra/clk-periph.c               |  4 +-
 drivers/clk/tegra/clk-pll.c                  | 39 ++++++-----
 drivers/clk/ti/clk-dra7-atl.c                |  9 +--
 drivers/clk/ti/composite.c                   |  4 +-
 drivers/clk/ti/divider.c                     |  9 +--
 drivers/clk/ux500/clk-prcmu.c                | 13 +++-
 drivers/clk/versatile/clk-icst.c             |  9 +--
 drivers/clk/versatile/clk-vexpress-osc.c     | 12 ++--
 drivers/clk/zynq/pll.c                       |  7 +-
 drivers/gpu/drm/imx/imx-tve.c                | 15 +++--
 drivers/gpu/drm/msm/hdmi/hdmi_phy_8960.c     |  7 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c |  7 +-
 drivers/media/platform/omap3isp/isp.c        |  6 +-
 drivers/rtc/rtc-hym8563.c                    | 14 ++--
 include/linux/clk-provider.h                 |  6 +-
 include/linux/clk/ti.h                       | 12 ++--
 74 files changed, 659 insertions(+), 469 deletions(-)

Comments

Stephen Boyd May 7, 2015, 6:39 a.m. UTC | #1 
On 04/30, Boris Brezillon wrote:
> Clock rates are stored in an unsigned long field, but ->round_rate()
> (which returns a rounded rate from a requested one) returns a long
> value (errors are reported using negative error codes), which can lead
> to long overflow if the clock rate exceed 2Ghz.
> 
> Change ->round_rate() prototype to return 0 or an error code, and pass the
> requested rate as a pointer so that it can be adjusted depending on
> hardware capabilities.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Tested-by: Mikko Perttunen <mikko.perttunen@kapsi.fi>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>

This patch is fairly invasive, and it probably doesn't even
matter for most of these clock providers to be able to round a
rate above 2GHz. I've been trying to remove the .round_rate op
from the framework by encouraging new features via the
.determine_rate op. Sadly, we still have to do a flag day and
change all the .determine_rate ops when we want to add things.

What if we changed determine_rate ops to take a struct
clk_determine_info (or some better named structure) instead of
the current list of arguments that it currently takes? Then when
we want to make these sorts of framework wide changes we can just
throw a new member into that structure and be done.

It doesn't solve the unsigned long to int return value problem
though. We can solve that by gradually introducing a new op and
handling another case in the rounding path. If we can come up
with some good name for that new op like .decide_rate or
something then it makes things nicer in the long run. I like the
name .determine_rate though :/

The benefit of all this is that we don't have to worry about
finding the random clk providers that get added into other
subsystems and fixing them up. If drivers actually care about
this problem then they'll be fixed to use the proper op. FYI,
last time we updated the function signature of .determine_rate we
broke a couple drivers along the way.
Boris BREZILLON May 7, 2015, 7:37 a.m. UTC | #2 
Hi Stephen,

On Wed, 6 May 2015 23:39:53 -0700
Stephen Boyd <sboyd@codeaurora.org> wrote:

> On 04/30, Boris Brezillon wrote:
> > Clock rates are stored in an unsigned long field, but ->round_rate()
> > (which returns a rounded rate from a requested one) returns a long
> > value (errors are reported using negative error codes), which can lead
> > to long overflow if the clock rate exceed 2Ghz.
> > 
> > Change ->round_rate() prototype to return 0 or an error code, and pass the
> > requested rate as a pointer so that it can be adjusted depending on
> > hardware capabilities.
> > 
> > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > Tested-by: Mikko Perttunen <mikko.perttunen@kapsi.fi>
> > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> 
> This patch is fairly invasive, and it probably doesn't even
> matter for most of these clock providers to be able to round a
> rate above 2GHz.

Fair enough.

> I've been trying to remove the .round_rate op
> from the framework by encouraging new features via the
> .determine_rate op.

Oh, I wasn't aware of that (BTW, that's a good thing).
Maybe this should be clearly stated (both in the struct clk_ops
kerneldoc header and in Documentation/clk.txt).

> Sadly, we still have to do a flag day and
> change all the .determine_rate ops when we want to add things.

Yes, but the number of clk drivers implementing ->determine_rate() is
still quite limited compared to those implementing ->round_rate().

> 
> What if we changed determine_rate ops to take a struct
> clk_determine_info (or some better named structure) instead of
> the current list of arguments that it currently takes? Then when
> we want to make these sorts of framework wide changes we can just
> throw a new member into that structure and be done.

I really like this idea, especially since I was wondering if we could
pass other 'clk rate requirements' like the rounding policy (down,
closest, up), or the maximum clk inaccuracy.

> 
> It doesn't solve the unsigned long to int return value problem
> though. We can solve that by gradually introducing a new op and
> handling another case in the rounding path. If we can come up
> with some good name for that new op like .decide_rate or
> something then it makes things nicer in the long run. I like the
> name .determine_rate though :/

Why not changing the ->determine_rate() prototype. As said above, the
number of clk drivers implementing this function is still quite
limited, and I guess we can have an ack for all of them.

> 
> The benefit of all this is that we don't have to worry about
> finding the random clk providers that get added into other
> subsystems and fixing them up. If drivers actually care about
> this problem then they'll be fixed to use the proper op. FYI,
> last time we updated the function signature of .determine_rate we
> broke a couple drivers along the way.
> 

Hm, IMHO, adding a new op is not a good thing. I agree that it eases
the transition, but ITOH you'll have to live with old/deprecated ops in
your clk_ops structure with people introducing new drivers still using
the old ops (see the number of clk drivers implementing ->round_rate()
instead of ->determine_rate()).

Best Regards,

Boris
Boris BREZILLON May 15, 2015, 3:40 p.m. UTC | #3 
Hi Stephen,

Adding Mikko in the loop (after all, he was the one complaining about
this signed long limitation in the first place, and I forgot to add
him in the Cc list :-/).

Mikko, are you okay with the approach proposed by Stephen (adding a
new method) ?

On Thu, 7 May 2015 09:37:02 +0200
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:

> Hi Stephen,
> 
> On Wed, 6 May 2015 23:39:53 -0700
> Stephen Boyd <sboyd@codeaurora.org> wrote:
> 
> > On 04/30, Boris Brezillon wrote:
> > > Clock rates are stored in an unsigned long field, but ->round_rate()
> > > (which returns a rounded rate from a requested one) returns a long
> > > value (errors are reported using negative error codes), which can lead
> > > to long overflow if the clock rate exceed 2Ghz.
> > > 
> > > Change ->round_rate() prototype to return 0 or an error code, and pass the
> > > requested rate as a pointer so that it can be adjusted depending on
> > > hardware capabilities.
> > > 
> > > Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> > > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > > Tested-by: Mikko Perttunen <mikko.perttunen@kapsi.fi>
> > > Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> > 
> > This patch is fairly invasive, and it probably doesn't even
> > matter for most of these clock providers to be able to round a
> > rate above 2GHz.
> 
> Fair enough.
> 
> > I've been trying to remove the .round_rate op
> > from the framework by encouraging new features via the
> > .determine_rate op.
> 
> Oh, I wasn't aware of that (BTW, that's a good thing).
> Maybe this should be clearly stated (both in the struct clk_ops
> kerneldoc header and in Documentation/clk.txt).
> 
> > Sadly, we still have to do a flag day and
> > change all the .determine_rate ops when we want to add things.
> 
> Yes, but the number of clk drivers implementing ->determine_rate() is
> still quite limited compared to those implementing ->round_rate().
> 
> > 
> > What if we changed determine_rate ops to take a struct
> > clk_determine_info (or some better named structure) instead of
> > the current list of arguments that it currently takes? Then when
> > we want to make these sorts of framework wide changes we can just
> > throw a new member into that structure and be done.
> 
> I really like this idea, especially since I was wondering if we could
> pass other 'clk rate requirements' like the rounding policy (down,
> closest, up), or the maximum clk inaccuracy.
> 
> > 
> > It doesn't solve the unsigned long to int return value problem
> > though. We can solve that by gradually introducing a new op and
> > handling another case in the rounding path. If we can come up
> > with some good name for that new op like .decide_rate or
> > something then it makes things nicer in the long run. I like the
> > name .determine_rate though :/

Okay, if you want a new method, how about this one:

struct clk_adjust_rate_req {
	/* fields filled by the caller */
	unsigned long rate; /* rate is updated by the clk driver */
	unsigned long min;
	unsigned long max;

	/* fields filled by the clk driver */
	struct clk_hw *best_parent;
	unsigned long best_parent_rate;

	/*
	 * new fields I'd like to add at some point:
	 * unsigned long max_inaccuracy;
	 * something about the power consumption constraints :-)
	 */
};

int (*adjust_rate)(struct clk_hw *hw, struct clk_adjust_rate_req *req);

> 
> Why not changing the ->determine_rate() prototype. As said above, the
> number of clk drivers implementing this function is still quite
> limited, and I guess we can have an ack for all of them.
> 
> > 
> > The benefit of all this is that we don't have to worry about
> > finding the random clk providers that get added into other
> > subsystems and fixing them up. If drivers actually care about
> > this problem then they'll be fixed to use the proper op. FYI,
> > last time we updated the function signature of .determine_rate we
> > broke a couple drivers along the way.
> > 
> 
> Hm, IMHO, adding a new op is not a good thing. I agree that it eases
> the transition, but ITOH you'll have to live with old/deprecated ops in
> your clk_ops structure with people introducing new drivers still using
> the old ops (see the number of clk drivers implementing ->round_rate()
> instead of ->determine_rate()).
> 
> Best Regards,
> 
> Boris
>
Mikko Perttunen May 16, 2015, 11:14 a.m. UTC | #4 
On 05/15/2015 06:40 PM, Boris Brezillon wrote:
> Hi Stephen,
>
> Adding Mikko in the loop (after all, he was the one complaining about
> this signed long limitation in the first place, and I forgot to add
> him in the Cc list :-/).

I think I got it through linux-tegra anyway, but thanks :)

>
> Mikko, are you okay with the approach proposed by Stephen (adding a
> new method) ?

Yes, sounds good to me. If a driver uses the existing methods with too 
large frequencies, the issue is pretty discoverable anyway. I think 
"adjust_rate" sounds a bit too much like it sets the clock's rate, 
though; perhaps "adjust_rate_request" or something like that?

Thanks,
Mikko

>
> On Thu, 7 May 2015 09:37:02 +0200
> Boris Brezillon <boris.brezillon@free-electrons.com> wrote:
>
>> Hi Stephen,
>>
>> On Wed, 6 May 2015 23:39:53 -0700
>> Stephen Boyd <sboyd@codeaurora.org> wrote:
>>
>>> On 04/30, Boris Brezillon wrote:
>>>> Clock rates are stored in an unsigned long field, but ->round_rate()
>>>> (which returns a rounded rate from a requested one) returns a long
>>>> value (errors are reported using negative error codes), which can lead
>>>> to long overflow if the clock rate exceed 2Ghz.
>>>>
>>>> Change ->round_rate() prototype to return 0 or an error code, and pass the
>>>> requested rate as a pointer so that it can be adjusted depending on
>>>> hardware capabilities.
>>>>
>>>> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>>>> Tested-by: Heiko Stuebner <heiko@sntech.de>
>>>> Tested-by: Mikko Perttunen <mikko.perttunen@kapsi.fi>
>>>> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
>>>
>>> This patch is fairly invasive, and it probably doesn't even
>>> matter for most of these clock providers to be able to round a
>>> rate above 2GHz.
>>
>> Fair enough.
>>
>>> I've been trying to remove the .round_rate op
>>> from the framework by encouraging new features via the
>>> .determine_rate op.
>>
>> Oh, I wasn't aware of that (BTW, that's a good thing).
>> Maybe this should be clearly stated (both in the struct clk_ops
>> kerneldoc header and in Documentation/clk.txt).
>>
>>> Sadly, we still have to do a flag day and
>>> change all the .determine_rate ops when we want to add things.
>>
>> Yes, but the number of clk drivers implementing ->determine_rate() is
>> still quite limited compared to those implementing ->round_rate().
>>
>>>
>>> What if we changed determine_rate ops to take a struct
>>> clk_determine_info (or some better named structure) instead of
>>> the current list of arguments that it currently takes? Then when
>>> we want to make these sorts of framework wide changes we can just
>>> throw a new member into that structure and be done.
>>
>> I really like this idea, especially since I was wondering if we could
>> pass other 'clk rate requirements' like the rounding policy (down,
>> closest, up), or the maximum clk inaccuracy.
>>
>>>
>>> It doesn't solve the unsigned long to int return value problem
>>> though. We can solve that by gradually introducing a new op and
>>> handling another case in the rounding path. If we can come up
>>> with some good name for that new op like .decide_rate or
>>> something then it makes things nicer in the long run. I like the
>>> name .determine_rate though :/
>
> Okay, if you want a new method, how about this one:
>
> struct clk_adjust_rate_req {
> 	/* fields filled by the caller */
> 	unsigned long rate; /* rate is updated by the clk driver */
> 	unsigned long min;
> 	unsigned long max;
>
> 	/* fields filled by the clk driver */
> 	struct clk_hw *best_parent;
> 	unsigned long best_parent_rate;
>
> 	/*
> 	 * new fields I'd like to add at some point:
> 	 * unsigned long max_inaccuracy;
> 	 * something about the power consumption constraints :-)
> 	 */
> };
>
> int (*adjust_rate)(struct clk_hw *hw, struct clk_adjust_rate_req *req);
>
>>
>> Why not changing the ->determine_rate() prototype. As said above, the
>> number of clk drivers implementing this function is still quite
>> limited, and I guess we can have an ack for all of them.
>>
>>>
>>> The benefit of all this is that we don't have to worry about
>>> finding the random clk providers that get added into other
>>> subsystems and fixing them up. If drivers actually care about
>>> this problem then they'll be fixed to use the proper op. FYI,
>>> last time we updated the function signature of .determine_rate we
>>> broke a couple drivers along the way.
>>>
>>
>> Hm, IMHO, adding a new op is not a good thing. I agree that it eases
>> the transition, but ITOH you'll have to live with old/deprecated ops in
>> your clk_ops structure with people introducing new drivers still using
>> the old ops (see the number of clk drivers implementing ->round_rate()
>> instead of ->determine_rate()).
>>
>> Best Regards,
>>
>> Boris
>>
>
>
>

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Stephen Boyd May 20, 2015, 1:01 a.m. UTC | #5 
On 05/16, Mikko Perttunen wrote:
> On 05/15/2015 06:40 PM, Boris Brezillon wrote:
> >Hi Stephen,
> >
> >Adding Mikko in the loop (after all, he was the one complaining about
> >this signed long limitation in the first place, and I forgot to add
> >him in the Cc list :-/).
> 
> I think I got it through linux-tegra anyway, but thanks :)
> 
> >
> >Mikko, are you okay with the approach proposed by Stephen (adding a
> >new method) ?
> 
> Yes, sounds good to me. If a driver uses the existing methods with
> too large frequencies, the issue is pretty discoverable anyway. I
> think "adjust_rate" sounds a bit too much like it sets the clock's
> rate, though; perhaps "adjust_rate_request" or something like that?
> 

Well I'm also OK with changing the determine_rate API one more
time, but we'll have to be careful. Invariably someone will push
a new clock driver through some non-clk tree path and we'll get
build breakage. They shouldn't be doing that, so either we do the
change now and push it to -next and see what breaks, or we do
this after -rc1 comes out and make sure everyone has lots of
warning.
Paul Walmsley June 4, 2015, 11:02 p.m. UTC | #6 
Hi folks

just a brief comment on this one:

On Thu, 30 Apr 2015, Boris Brezillon wrote:

> Clock rates are stored in an unsigned long field, but ->round_rate()
> (which returns a rounded rate from a requested one) returns a long
> value (errors are reported using negative error codes), which can lead
> to long overflow if the clock rate exceed 2Ghz.
> 
> Change ->round_rate() prototype to return 0 or an error code, and pass the
> requested rate as a pointer so that it can be adjusted depending on
> hardware capabilities.

...

> diff --git a/Documentation/clk.txt b/Documentation/clk.txt
> index 0e4f90a..fca8b7a 100644
> --- a/Documentation/clk.txt
> +++ b/Documentation/clk.txt
> @@ -68,8 +68,8 @@ the operations defined in clk.h:
>  		int		(*is_enabled)(struct clk_hw *hw);
>  		unsigned long	(*recalc_rate)(struct clk_hw *hw,
>  						unsigned long parent_rate);
> -		long		(*round_rate)(struct clk_hw *hw,
> -						unsigned long rate,
> +		int		(*round_rate)(struct clk_hw *hw,
> +						unsigned long *rate,
>  						unsigned long *parent_rate);
>  		long		(*determine_rate)(struct clk_hw *hw,
>  						unsigned long rate,

I'd suggest that we should probably go straight to 64-bit rates.  There 
are already plenty of clock sources that can generate rates higher than 
4GiHz.


- Paul
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Jon Hunter June 5, 2015, 8:46 a.m. UTC | #7 
On 05/06/15 00:02, Paul Walmsley wrote:
> Hi folks
> 
> just a brief comment on this one:
> 
> On Thu, 30 Apr 2015, Boris Brezillon wrote:
> 
>> Clock rates are stored in an unsigned long field, but ->round_rate()
>> (which returns a rounded rate from a requested one) returns a long
>> value (errors are reported using negative error codes), which can lead
>> to long overflow if the clock rate exceed 2Ghz.
>>
>> Change ->round_rate() prototype to return 0 or an error code, and pass the
>> requested rate as a pointer so that it can be adjusted depending on
>> hardware capabilities.
> 
> ...
> 
>> diff --git a/Documentation/clk.txt b/Documentation/clk.txt
>> index 0e4f90a..fca8b7a 100644
>> --- a/Documentation/clk.txt
>> +++ b/Documentation/clk.txt
>> @@ -68,8 +68,8 @@ the operations defined in clk.h:
>>  		int		(*is_enabled)(struct clk_hw *hw);
>>  		unsigned long	(*recalc_rate)(struct clk_hw *hw,
>>  						unsigned long parent_rate);
>> -		long		(*round_rate)(struct clk_hw *hw,
>> -						unsigned long rate,
>> +		int		(*round_rate)(struct clk_hw *hw,
>> +						unsigned long *rate,
>>  						unsigned long *parent_rate);
>>  		long		(*determine_rate)(struct clk_hw *hw,
>>  						unsigned long rate,
> 
> I'd suggest that we should probably go straight to 64-bit rates.  There 
> are already plenty of clock sources that can generate rates higher than 
> 4GiHz.

An alternative would be to introduce to a frequency "base" the default
could be Hz (for backwards compatibility), but for CPUs we probably only
care about MHz (or may be kHz) and so 32-bits would still suffice. Even
if CPUs cared about Hz they could still use Hz, but in that case they
probably don't care about GHz. Obviously, we don't want to break DT
compatibility but may be the frequency base could be defined in DT and
if it is missing then Hz is assumed. Just a thought ...

Jon
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Boris BREZILLON June 5, 2015, 11:38 a.m. UTC | #8 
Hi Paul,

On Thu, 4 Jun 2015 23:02:25 +0000 (UTC)
Paul Walmsley <paul@pwsan.com> wrote:

> Hi folks
> 
> just a brief comment on this one:
> 
> On Thu, 30 Apr 2015, Boris Brezillon wrote:
> 
> > Clock rates are stored in an unsigned long field, but ->round_rate()
> > (which returns a rounded rate from a requested one) returns a long
> > value (errors are reported using negative error codes), which can lead
> > to long overflow if the clock rate exceed 2Ghz.
> > 
> > Change ->round_rate() prototype to return 0 or an error code, and pass the
> > requested rate as a pointer so that it can be adjusted depending on
> > hardware capabilities.
> 
> ...
> 
> > diff --git a/Documentation/clk.txt b/Documentation/clk.txt
> > index 0e4f90a..fca8b7a 100644
> > --- a/Documentation/clk.txt
> > +++ b/Documentation/clk.txt
> > @@ -68,8 +68,8 @@ the operations defined in clk.h:
> >  		int		(*is_enabled)(struct clk_hw *hw);
> >  		unsigned long	(*recalc_rate)(struct clk_hw *hw,
> >  						unsigned long parent_rate);
> > -		long		(*round_rate)(struct clk_hw *hw,
> > -						unsigned long rate,
> > +		int		(*round_rate)(struct clk_hw *hw,
> > +						unsigned long *rate,
> >  						unsigned long *parent_rate);
> >  		long		(*determine_rate)(struct clk_hw *hw,
> >  						unsigned long rate,
> 
> I'd suggest that we should probably go straight to 64-bit rates.  There 
> are already plenty of clock sources that can generate rates higher than 
> 4GiHz.

Yep, that was something I was considering too. If Stephen agrees I'll
change that in the next version.
BTW, you're referring to the second version of this patch, but things
have changed a bit: Stephen recommended to only modify the
->determine_rate() prototype and pass a structure instead of a list of
arguments.
Here is the last version of this series [1].

Best Regards,

Boris

[1]http://patchwork.linux-mips.org/patch/10092/
Boris BREZILLON June 5, 2015, 11:39 a.m. UTC | #9 
Hi Jon,

On Fri, 5 Jun 2015 09:46:09 +0100
Jon Hunter <jonathanh@nvidia.com> wrote:

> 
> On 05/06/15 00:02, Paul Walmsley wrote:
> > Hi folks
> > 
> > just a brief comment on this one:
> > 
> > On Thu, 30 Apr 2015, Boris Brezillon wrote:
> > 
> >> Clock rates are stored in an unsigned long field, but ->round_rate()
> >> (which returns a rounded rate from a requested one) returns a long
> >> value (errors are reported using negative error codes), which can lead
> >> to long overflow if the clock rate exceed 2Ghz.
> >>
> >> Change ->round_rate() prototype to return 0 or an error code, and pass the
> >> requested rate as a pointer so that it can be adjusted depending on
> >> hardware capabilities.
> > 
> > ...
> > 
> >> diff --git a/Documentation/clk.txt b/Documentation/clk.txt
> >> index 0e4f90a..fca8b7a 100644
> >> --- a/Documentation/clk.txt
> >> +++ b/Documentation/clk.txt
> >> @@ -68,8 +68,8 @@ the operations defined in clk.h:
> >>  		int		(*is_enabled)(struct clk_hw *hw);
> >>  		unsigned long	(*recalc_rate)(struct clk_hw *hw,
> >>  						unsigned long parent_rate);
> >> -		long		(*round_rate)(struct clk_hw *hw,
> >> -						unsigned long rate,
> >> +		int		(*round_rate)(struct clk_hw *hw,
> >> +						unsigned long *rate,
> >>  						unsigned long *parent_rate);
> >>  		long		(*determine_rate)(struct clk_hw *hw,
> >>  						unsigned long rate,
> > 
> > I'd suggest that we should probably go straight to 64-bit rates.  There 
> > are already plenty of clock sources that can generate rates higher than 
> > 4GiHz.
> 
> An alternative would be to introduce to a frequency "base" the default
> could be Hz (for backwards compatibility), but for CPUs we probably only
> care about MHz (or may be kHz) and so 32-bits would still suffice. Even
> if CPUs cared about Hz they could still use Hz, but in that case they
> probably don't care about GHz. Obviously, we don't want to break DT
> compatibility but may be the frequency base could be defined in DT and
> if it is missing then Hz is assumed. Just a thought ...

Yes, but is it really worth the additional complexity. You'll have to
add the unit information anyway, so using an unsigned long for the
value and another field for the unit (an enum ?) is just like using a
64 bit integer.

Best Regards,

Boris
Jon Hunter June 8, 2015, 8:46 a.m. UTC | #10 
Hi Boris,

On 05/06/15 12:39, Boris Brezillon wrote:
> Hi Jon,
> 
> On Fri, 5 Jun 2015 09:46:09 +0100
> Jon Hunter <jonathanh@nvidia.com> wrote:
> 
>>
>> On 05/06/15 00:02, Paul Walmsley wrote:
>>> Hi folks
>>>
>>> just a brief comment on this one:
>>>
>>> On Thu, 30 Apr 2015, Boris Brezillon wrote:
>>>
>>>> Clock rates are stored in an unsigned long field, but ->round_rate()
>>>> (which returns a rounded rate from a requested one) returns a long
>>>> value (errors are reported using negative error codes), which can lead
>>>> to long overflow if the clock rate exceed 2Ghz.
>>>>
>>>> Change ->round_rate() prototype to return 0 or an error code, and pass the
>>>> requested rate as a pointer so that it can be adjusted depending on
>>>> hardware capabilities.
>>>
>>> ...
>>>
>>>> diff --git a/Documentation/clk.txt b/Documentation/clk.txt
>>>> index 0e4f90a..fca8b7a 100644
>>>> --- a/Documentation/clk.txt
>>>> +++ b/Documentation/clk.txt
>>>> @@ -68,8 +68,8 @@ the operations defined in clk.h:
>>>>  		int		(*is_enabled)(struct clk_hw *hw);
>>>>  		unsigned long	(*recalc_rate)(struct clk_hw *hw,
>>>>  						unsigned long parent_rate);
>>>> -		long		(*round_rate)(struct clk_hw *hw,
>>>> -						unsigned long rate,
>>>> +		int		(*round_rate)(struct clk_hw *hw,
>>>> +						unsigned long *rate,
>>>>  						unsigned long *parent_rate);
>>>>  		long		(*determine_rate)(struct clk_hw *hw,
>>>>  						unsigned long rate,
>>>
>>> I'd suggest that we should probably go straight to 64-bit rates.  There 
>>> are already plenty of clock sources that can generate rates higher than 
>>> 4GiHz.
>>
>> An alternative would be to introduce to a frequency "base" the default
>> could be Hz (for backwards compatibility), but for CPUs we probably only
>> care about MHz (or may be kHz) and so 32-bits would still suffice. Even
>> if CPUs cared about Hz they could still use Hz, but in that case they
>> probably don't care about GHz. Obviously, we don't want to break DT
>> compatibility but may be the frequency base could be defined in DT and
>> if it is missing then Hz is assumed. Just a thought ...
> 
> Yes, but is it really worth the additional complexity. You'll have to
> add the unit information anyway, so using an unsigned long for the
> value and another field for the unit (an enum ?) is just like using a
> 64 bit integer.

For a storage perspective, yes it would be the same. However, there are
probably a lot of devices that would not need the extra range, but would
now have to deal with 64-bit types. I have no idea how much overhead
that would be in reality. If the overhead is negligible then a 64-bit
type is definitely the way to go, as I agree it is simpler and cleaner.

Cheers
Jon
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diff mbox

Patch

diff --git a/Documentation/clk.txt b/Documentation/clk.txt
index 0e4f90a..fca8b7a 100644
--- a/Documentation/clk.txt
+++ b/Documentation/clk.txt
@@ -68,8 +68,8 @@  the operations defined in clk.h:
 		int		(*is_enabled)(struct clk_hw *hw);
 		unsigned long	(*recalc_rate)(struct clk_hw *hw,
 						unsigned long parent_rate);
-		long		(*round_rate)(struct clk_hw *hw,
-						unsigned long rate,
+		int		(*round_rate)(struct clk_hw *hw,
+						unsigned long *rate,
 						unsigned long *parent_rate);
 		long		(*determine_rate)(struct clk_hw *hw,
 						unsigned long rate,
diff --git a/arch/arm/mach-imx/clk-busy.c b/arch/arm/mach-imx/clk-busy.c
index 4bb1bc4..f8c67e9 100644
--- a/arch/arm/mach-imx/clk-busy.c
+++ b/arch/arm/mach-imx/clk-busy.c
@@ -51,7 +51,7 @@  static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
 	return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
 }
 
-static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long *rate,
 					unsigned long *prate)
 {
 	struct clk_busy_divider *busy = to_clk_busy_divider(hw);
diff --git a/arch/arm/mach-imx/clk-cpu.c b/arch/arm/mach-imx/clk-cpu.c
index aa1c345..f6af2d8 100644
--- a/arch/arm/mach-imx/clk-cpu.c
+++ b/arch/arm/mach-imx/clk-cpu.c
@@ -34,12 +34,18 @@  static unsigned long clk_cpu_recalc_rate(struct clk_hw *hw,
 	return clk_get_rate(cpu->div);
 }
 
-static long clk_cpu_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *prate)
+static int clk_cpu_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *prate)
 {
 	struct clk_cpu *cpu = to_clk_cpu(hw);
+	long ret;
 
-	return clk_round_rate(cpu->pll, rate);
+	ret = clk_round_rate(cpu->pll, *rate);
+	if (ret < 0)
+		return ret;
+
+	*rate = ret;
+	return 0;
 }
 
 static int clk_cpu_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/arch/arm/mach-imx/clk-fixup-div.c b/arch/arm/mach-imx/clk-fixup-div.c
index 21db020..c2f4f00 100644
--- a/arch/arm/mach-imx/clk-fixup-div.c
+++ b/arch/arm/mach-imx/clk-fixup-div.c
@@ -48,7 +48,7 @@  static unsigned long clk_fixup_div_recalc_rate(struct clk_hw *hw,
 	return fixup_div->ops->recalc_rate(&fixup_div->divider.hw, parent_rate);
 }
 
-static long clk_fixup_div_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_fixup_div_round_rate(struct clk_hw *hw, unsigned long *rate,
 			       unsigned long *prate)
 {
 	struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
diff --git a/arch/arm/mach-imx/clk-pfd.c b/arch/arm/mach-imx/clk-pfd.c
index 0b0f6f6..449fb7a 100644
--- a/arch/arm/mach-imx/clk-pfd.c
+++ b/arch/arm/mach-imx/clk-pfd.c
@@ -68,14 +68,14 @@  static unsigned long clk_pfd_recalc_rate(struct clk_hw *hw,
 	return tmp;
 }
 
-static long clk_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *prate)
+static int clk_pfd_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *prate)
 {
 	u64 tmp = *prate;
 	u8 frac;
 
-	tmp = tmp * 18 + rate / 2;
-	do_div(tmp, rate);
+	tmp = tmp * 18 + *rate / 2;
+	do_div(tmp, *rate);
 	frac = tmp;
 	if (frac < 12)
 		frac = 12;
@@ -85,7 +85,8 @@  static long clk_pfd_round_rate(struct clk_hw *hw, unsigned long rate,
 	tmp *= 18;
 	do_div(tmp, frac);
 
-	return tmp;
+	*rate = tmp;
+	return 0;
 }
 
 static int clk_pfd_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/arch/arm/mach-imx/clk-pllv2.c b/arch/arm/mach-imx/clk-pllv2.c
index 20889d5..6b48bf5 100644
--- a/arch/arm/mach-imx/clk-pllv2.c
+++ b/arch/arm/mach-imx/clk-pllv2.c
@@ -180,14 +180,16 @@  static int clk_pllv2_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }
 
-static long clk_pllv2_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_pllv2_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *prate)
 {
 	u32 dp_op, dp_mfd, dp_mfn;
 
-	__clk_pllv2_set_rate(rate, *prate, &dp_op, &dp_mfd, &dp_mfn);
-	return __clk_pllv2_recalc_rate(*prate, MXC_PLL_DP_CTL_DPDCK0_2_EN,
+	__clk_pllv2_set_rate(*rate, *prate, &dp_op, &dp_mfd, &dp_mfn);
+	*rate = __clk_pllv2_recalc_rate(*prate, MXC_PLL_DP_CTL_DPDCK0_2_EN,
 			dp_op, dp_mfd, dp_mfn);
+
+	return 0;
 }
 
 static int clk_pllv2_prepare(struct clk_hw *hw)
diff --git a/arch/arm/mach-imx/clk-pllv3.c b/arch/arm/mach-imx/clk-pllv3.c
index 641ebc5..4d8f4eb 100644
--- a/arch/arm/mach-imx/clk-pllv3.c
+++ b/arch/arm/mach-imx/clk-pllv3.c
@@ -104,13 +104,15 @@  static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
 	return (div == 1) ? parent_rate * 22 : parent_rate * 20;
 }
 
-static long clk_pllv3_round_rate(struct clk_hw *hw, unsigned long rate,
-				 unsigned long *prate)
+static int clk_pllv3_round_rate(struct clk_hw *hw, unsigned long *rate,
+				unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
 
-	return (rate >= parent_rate * 22) ? parent_rate * 22 :
-					    parent_rate * 20;
+	*rate = (*rate >= parent_rate * 22) ? parent_rate * 22 :
+					      parent_rate * 20;
+
+	return 0;
 }
 
 static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -151,21 +153,23 @@  static unsigned long clk_pllv3_sys_recalc_rate(struct clk_hw *hw,
 	return parent_rate * div / 2;
 }
 
-static long clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long rate,
-				     unsigned long *prate)
+static int clk_pllv3_sys_round_rate(struct clk_hw *hw, unsigned long *rate,
+				    unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
 	unsigned long min_rate = parent_rate * 54 / 2;
 	unsigned long max_rate = parent_rate * 108 / 2;
 	u32 div;
 
-	if (rate > max_rate)
-		rate = max_rate;
-	else if (rate < min_rate)
-		rate = min_rate;
-	div = rate * 2 / parent_rate;
+	if (*rate > max_rate)
+		*rate = max_rate;
+	else if (*rate < min_rate)
+		*rate = min_rate;
+	div = *rate * 2 / parent_rate;
 
-	return parent_rate * div / 2;
+	*rate = parent_rate * div / 2;
+
+	return 0;
 }
 
 static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -207,7 +211,7 @@  static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
 	return (parent_rate * div) + ((parent_rate / mfd) * mfn);
 }
 
-static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long *rate,
 				    unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
@@ -217,18 +221,20 @@  static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
 	u32 mfn, mfd = 1000000;
 	s64 temp64;
 
-	if (rate > max_rate)
-		rate = max_rate;
-	else if (rate < min_rate)
-		rate = min_rate;
+	if (*rate > max_rate)
+		*rate = max_rate;
+	else if (*rate < min_rate)
+		*rate = min_rate;
 
-	div = rate / parent_rate;
-	temp64 = (u64) (rate - div * parent_rate);
+	div = *rate / parent_rate;
+	temp64 = (u64) (*rate - div * parent_rate);
 	temp64 *= mfd;
 	do_div(temp64, parent_rate);
 	mfn = temp64;
 
-	return parent_rate * div + parent_rate / mfd * mfn;
+	*rate = parent_rate * div + parent_rate / mfd * mfn;
+
+	return 0;
 }
 
 static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/arch/arm/mach-msm/clock-pcom.c b/arch/arm/mach-msm/clock-pcom.c
index f5b69d7..118c288 100644
--- a/arch/arm/mach-msm/clock-pcom.c
+++ b/arch/arm/mach-msm/clock-pcom.c
@@ -109,11 +109,11 @@  static int pc_clk_is_enabled(struct clk_hw *hw)
 		return id;
 }
 
-static long pc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int pc_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 			      unsigned long *p_rate)
 {
 	/* Not really supported; pc_clk_set_rate() does rounding on it's own. */
-	return rate;
+	return 0;
 }
 
 static struct clk_ops clk_ops_pcom = {
diff --git a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
index 85e0b0c0..2829a6f 100644
--- a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
+++ b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
@@ -71,8 +71,8 @@  unsigned long omap2_table_mpu_recalc(struct clk_hw *clk,
  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
  * just uses the ARM rates.
  */
-long omap2_round_to_table_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *parent_rate)
+int omap2_round_to_table_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *parent_rate)
 {
 	const struct prcm_config *ptr;
 	long highest_rate;
@@ -88,10 +88,15 @@  long omap2_round_to_table_rate(struct clk_hw *hw, unsigned long rate,
 		highest_rate = ptr->mpu_speed;
 
 		/* Can check only after xtal frequency check */
-		if (ptr->mpu_speed <= rate)
+		if (ptr->mpu_speed <= *rate)
 			break;
 	}
-	return highest_rate;
+
+	if (highest_rate < 0)
+		return highest_rate;
+
+	*rate = highest_rate;
+	return 0;
 }
 
 /* Sets basic clocks based on the specified rate */
diff --git a/arch/arm/mach-omap2/clkt_clksel.c b/arch/arm/mach-omap2/clkt_clksel.c
index 7ee2610..b932276 100644
--- a/arch/arm/mach-omap2/clkt_clksel.c
+++ b/arch/arm/mach-omap2/clkt_clksel.c
@@ -385,13 +385,15 @@  unsigned long omap2_clksel_recalc(struct clk_hw *hw, unsigned long parent_rate)
  *
  * Returns the rounded clock rate or returns 0xffffffff on error.
  */
-long omap2_clksel_round_rate(struct clk_hw *hw, unsigned long target_rate,
+int omap2_clksel_round_rate(struct clk_hw *hw, unsigned long *target_rate,
 			unsigned long *parent_rate)
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
 	u32 new_div;
 
-	return omap2_clksel_round_rate_div(clk, target_rate, &new_div);
+	*target_rate = omap2_clksel_round_rate_div(clk, *target_rate,
+						   &new_div);
+	return 0;
 }
 
 /**
diff --git a/arch/arm/mach-omap2/clkt_dpll.c b/arch/arm/mach-omap2/clkt_dpll.c
index f251a14..7dac6b3 100644
--- a/arch/arm/mach-omap2/clkt_dpll.c
+++ b/arch/arm/mach-omap2/clkt_dpll.c
@@ -280,7 +280,7 @@  unsigned long omap2_get_dpll_rate(struct clk_hw_omap *clk)
  * (expensive) function again.  Returns ~0 if the target rate cannot
  * be rounded, or the rounded rate upon success.
  */
-long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
+int omap2_dpll_round_rate(struct clk_hw *hw, unsigned long *target_rate,
 		unsigned long *parent_rate)
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
@@ -295,16 +295,16 @@  long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
 	const char *clk_name;
 
 	if (!clk || !clk->dpll_data)
-		return ~0;
+		return -EINVAL;
 
 	dd = clk->dpll_data;
 
 	ref_rate = __clk_get_rate(dd->clk_ref);
 	clk_name = __clk_get_name(hw->clk);
 	pr_debug("clock: %s: starting DPLL round_rate, target rate %lu\n",
-		 clk_name, target_rate);
+		 clk_name, *target_rate);
 
-	scaled_rt_rp = target_rate / (ref_rate / DPLL_SCALE_FACTOR);
+	scaled_rt_rp = *target_rate / (ref_rate / DPLL_SCALE_FACTOR);
 	scaled_max_m = dd->max_multiplier * DPLL_SCALE_FACTOR;
 
 	dd->last_rounded_rate = 0;
@@ -330,7 +330,7 @@  long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
 		if (m > scaled_max_m)
 			break;
 
-		r = _dpll_test_mult(&m, n, &new_rate, target_rate,
+		r = _dpll_test_mult(&m, n, &new_rate, *target_rate,
 				    ref_rate);
 
 		/* m can't be set low enough for this n - try with a larger n */
@@ -338,7 +338,7 @@  long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
 			continue;
 
 		/* skip rates above our target rate */
-		delta = target_rate - new_rate;
+		delta = *target_rate - new_rate;
 		if (delta < 0)
 			continue;
 
@@ -357,14 +357,15 @@  long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
 
 	if (prev_min_delta == LONG_MAX) {
 		pr_debug("clock: %s: cannot round to rate %lu\n",
-			 clk_name, target_rate);
-		return ~0;
+			 clk_name, *target_rate);
+		return -EINVAL;
 	}
 
 	dd->last_rounded_m = min_delta_m;
 	dd->last_rounded_n = min_delta_n;
-	dd->last_rounded_rate = target_rate - prev_min_delta;
+	dd->last_rounded_rate = *target_rate - prev_min_delta;
 
-	return dd->last_rounded_rate;
+	*target_rate = dd->last_rounded_rate;
+	return 0;
 }
 
diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h
index a56742f..cfe41b7 100644
--- a/arch/arm/mach-omap2/clock.h
+++ b/arch/arm/mach-omap2/clock.h
@@ -194,8 +194,8 @@  u32 omap2_clksel_round_rate_div(struct clk_hw_omap *clk,
 				u32 *new_div);
 u8 omap2_clksel_find_parent_index(struct clk_hw *hw);
 unsigned long omap2_clksel_recalc(struct clk_hw *hw, unsigned long parent_rate);
-long omap2_clksel_round_rate(struct clk_hw *hw, unsigned long target_rate,
-				unsigned long *parent_rate);
+int omap2_clksel_round_rate(struct clk_hw *hw, unsigned long *target_rate,
+			    unsigned long *parent_rate);
 int omap2_clksel_set_rate(struct clk_hw *hw, unsigned long rate,
 				unsigned long parent_rate);
 int omap2_clksel_set_parent(struct clk_hw *hw, u8 field_val);
diff --git a/arch/arm/mach-omap2/dpll3xxx.c b/arch/arm/mach-omap2/dpll3xxx.c
index 44e57ec..7a6fb45 100644
--- a/arch/arm/mach-omap2/dpll3xxx.c
+++ b/arch/arm/mach-omap2/dpll3xxx.c
@@ -480,6 +480,7 @@  long omap3_noncore_dpll_determine_rate(struct clk_hw *hw, unsigned long rate,
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
 	struct dpll_data *dd;
+	int ret;
 
 	if (!hw || !rate)
 		return -EINVAL;
@@ -492,7 +493,10 @@  long omap3_noncore_dpll_determine_rate(struct clk_hw *hw, unsigned long rate,
 	    (dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
 		*best_parent_clk = __clk_get_hw(dd->clk_bypass);
 	} else {
-		rate = omap2_dpll_round_rate(hw, rate, best_parent_rate);
+		ret = omap2_dpll_round_rate(hw, &rate, best_parent_rate);
+		if (ret)
+			return ret;
+
 		*best_parent_clk = __clk_get_hw(dd->clk_ref);
 	}
 
@@ -768,27 +772,33 @@  int omap3_clkoutx2_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }
 
-long omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long rate,
+int omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *prate)
 {
 	const struct dpll_data *dd;
 	u32 v;
 	struct clk_hw_omap *pclk = NULL;
 
-	if (!*prate)
+	if (!*prate) {
+		*rate = 0;
 		return 0;
+	}
 
 	pclk = omap3_find_clkoutx2_dpll(hw);
 
-	if (!pclk)
+	if (!pclk) {
+		*rate = 0;
 		return 0;
+	}
 
 	dd = pclk->dpll_data;
 
 	/* TYPE J does not have a clkoutx2 */
 	if (dd->flags & DPLL_J_TYPE) {
-		*prate = __clk_round_rate(__clk_get_parent(pclk->hw.clk), rate);
-		return *prate;
+		*prate = __clk_round_rate(__clk_get_parent(pclk->hw.clk),
+					  *rate);
+		*rate = *prate;
+		return 0;
 	}
 
 	WARN_ON(!dd->enable_mask);
@@ -803,12 +813,13 @@  long omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
 		unsigned long best_parent;
 
-		best_parent = (rate / 2);
+		best_parent = (*rate / 2);
 		*prate = __clk_round_rate(__clk_get_parent(hw->clk),
 				best_parent);
 	}
 
-	return *prate * 2;
+	*rate = *prate * 2;
+	return 0;
 }
 
 /* OMAP3/4 non-CORE DPLL clkops */
diff --git a/arch/arm/mach-omap2/dpll44xx.c b/arch/arm/mach-omap2/dpll44xx.c
index f231be0..afd3284 100644
--- a/arch/arm/mach-omap2/dpll44xx.c
+++ b/arch/arm/mach-omap2/dpll44xx.c
@@ -146,11 +146,12 @@  unsigned long omap4_dpll_regm4xen_recalc(struct clk_hw *hw,
  * M-dividers) upon success, -EINVAL if @clk is null or not a DPLL, or
  * ~0 if an error occurred in omap2_dpll_round_rate().
  */
-long omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
-				    unsigned long target_rate,
-				    unsigned long *parent_rate)
+int omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
+				   unsigned long *target_rate,
+				   unsigned long *parent_rate)
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+	unsigned long rate = *target_rate;
 	struct dpll_data *dd;
 	long r;
 
@@ -166,7 +167,7 @@  long omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
 	 * target rate without using the 4X multiplier.
 	 */
 	r = omap2_dpll_round_rate(hw, target_rate, NULL);
-	if (r != ~0)
+	if (!r)
 		goto out;
 
 	/*
@@ -174,9 +175,9 @@  long omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
 	 * this time see if using the 4X multiplier can help. Enabling the
 	 * 4X multiplier is equivalent to dividing the target rate by 4.
 	 */
-	r = omap2_dpll_round_rate(hw, target_rate / OMAP4430_REGM4XEN_MULT,
-				  NULL);
-	if (r == ~0)
+	rate = *target_rate / OMAP4430_REGM4XEN_MULT;
+	r = omap2_dpll_round_rate(hw, &rate, NULL);
+	if (r)
 		return r;
 
 	dd->last_rounded_rate *= OMAP4430_REGM4XEN_MULT;
@@ -184,8 +185,9 @@  long omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
 
 out:
 	omap4_dpll_lpmode_recalc(dd);
+	*target_rate = dd->last_rounded_rate;
 
-	return dd->last_rounded_rate;
+	return 0;
 }
 
 /**
@@ -209,6 +211,7 @@  long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw, unsigned long rate,
 {
 	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
 	struct dpll_data *dd;
+	int ret;
 
 	if (!hw || !rate)
 		return -EINVAL;
@@ -221,8 +224,11 @@  long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw, unsigned long rate,
 	    (dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
 		*best_parent_clk = __clk_get_hw(dd->clk_bypass);
 	} else {
-		rate = omap4_dpll_regm4xen_round_rate(hw, rate,
-						      best_parent_rate);
+		ret = omap4_dpll_regm4xen_round_rate(hw, &rate,
+						     best_parent_rate);
+		if (ret)
+			return ret;
+
 		*best_parent_clk = __clk_get_hw(dd->clk_ref);
 	}
 
diff --git a/arch/arm/mach-vexpress/spc.c b/arch/arm/mach-vexpress/spc.c
index f61158c..774ac3b 100644
--- a/arch/arm/mach-vexpress/spc.c
+++ b/arch/arm/mach-vexpress/spc.c
@@ -507,12 +507,19 @@  static unsigned long spc_recalc_rate(struct clk_hw *hw,
 	return freq * 1000;
 }
 
-static long spc_round_rate(struct clk_hw *hw, unsigned long drate,
+static int spc_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *parent_rate)
 {
 	struct clk_spc *spc = to_clk_spc(hw);
+	long ret;
 
-	return ve_spc_round_performance(spc->cluster, drate);
+	ret = ve_spc_round_performance(spc->cluster, *drate);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+
+	return 0;
 }
 
 static int spc_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/arch/mips/alchemy/common/clock.c b/arch/mips/alchemy/common/clock.c
index 6a98d2c..d697d8f 100644
--- a/arch/mips/alchemy/common/clock.c
+++ b/arch/mips/alchemy/common/clock.c
@@ -202,24 +202,27 @@  static int alchemy_clk_aux_setr(struct clk_hw *hw,
 	return 0;
 }
 
-static long alchemy_clk_aux_roundr(struct clk_hw *hw,
-					    unsigned long rate,
+static int alchemy_clk_aux_roundr(struct clk_hw *hw,
+					    unsigned long *rate,
 					    unsigned long *parent_rate)
 {
 	struct alchemy_auxpll_clk *a = to_auxpll_clk(hw);
 	unsigned long mult;
 
-	if (!rate || !*parent_rate)
+	if (!*rate || !*parent_rate) {
+		*rate = 0;
 		return 0;
+	}
 
-	mult = rate / (*parent_rate);
+	mult = *rate / (*parent_rate);
 
 	if (mult && (mult < 7))
 		mult = 7;
 	if (mult > a->maxmult)
 		mult = a->maxmult;
 
-	return (*parent_rate) * mult;
+	*rate = (*parent_rate) * mult;
+	return 0;
 }
 
 static struct clk_ops alchemy_clkops_aux = {
diff --git a/drivers/clk/at91/clk-h32mx.c b/drivers/clk/at91/clk-h32mx.c
index 152dcb3..e48f31e 100644
--- a/drivers/clk/at91/clk-h32mx.c
+++ b/drivers/clk/at91/clk-h32mx.c
@@ -49,21 +49,25 @@  static unsigned long clk_sama5d4_h32mx_recalc_rate(struct clk_hw *hw,
 	return parent_rate;
 }
 
-static long clk_sama5d4_h32mx_round_rate(struct clk_hw *hw, unsigned long rate,
-				       unsigned long *parent_rate)
+static int clk_sama5d4_h32mx_round_rate(struct clk_hw *hw,
+					unsigned long *rate,
+					unsigned long *parent_rate)
 {
 	unsigned long div;
 
-	if (rate > *parent_rate)
-		return *parent_rate;
-	div = *parent_rate / 2;
-	if (rate < div)
-		return div;
+	if (*rate > *parent_rate) {
+		*rate = *parent_rate;
+		return 0;
+	}
 
-	if (rate - div < *parent_rate - rate)
-		return div;
+	div = *parent_rate / 2;
+	if (*rate < div || (*rate - div) < (*parent_rate - *rate)) {
+		*rate = div;
+		return 0;
+	}
 
-	return *parent_rate;
+	*rate = *parent_rate;
+	return 0;
 }
 
 static int clk_sama5d4_h32mx_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c
index 597fed4..d990ae0 100644
--- a/drivers/clk/at91/clk-peripheral.c
+++ b/drivers/clk/at91/clk-peripheral.c
@@ -227,9 +227,9 @@  clk_sam9x5_peripheral_recalc_rate(struct clk_hw *hw,
 	return parent_rate >> periph->div;
 }
 
-static long clk_sam9x5_peripheral_round_rate(struct clk_hw *hw,
-					     unsigned long rate,
-					     unsigned long *parent_rate)
+static int clk_sam9x5_peripheral_round_rate(struct clk_hw *hw,
+					    unsigned long *rate,
+					    unsigned long *parent_rate)
 {
 	int shift = 0;
 	unsigned long best_rate;
@@ -238,8 +238,10 @@  static long clk_sam9x5_peripheral_round_rate(struct clk_hw *hw,
 	unsigned long cur_diff;
 	struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
 
-	if (periph->id < PERIPHERAL_ID_MIN || !periph->range.max)
-		return *parent_rate;
+	if (periph->id < PERIPHERAL_ID_MIN || !periph->range.max) {
+		*rate = *parent_rate;
+		return 0;
+	}
 
 	if (periph->range.max) {
 		for (; shift < PERIPHERAL_MAX_SHIFT; shift++) {
@@ -249,28 +251,31 @@  static long clk_sam9x5_peripheral_round_rate(struct clk_hw *hw,
 		}
 	}
 
-	if (rate >= cur_rate)
-		return cur_rate;
+	if (*rate >= cur_rate) {
+		*rate = cur_rate;
+		return 0;
+	}
 
-	best_diff = cur_rate - rate;
+	best_diff = cur_rate - *rate;
 	best_rate = cur_rate;
 	for (; shift < PERIPHERAL_MAX_SHIFT; shift++) {
 		cur_rate = *parent_rate >> shift;
-		if (cur_rate < rate)
-			cur_diff = rate - cur_rate;
+		if (cur_rate < *rate)
+			cur_diff = *rate - cur_rate;
 		else
-			cur_diff = cur_rate - rate;
+			cur_diff = cur_rate - *rate;
 
 		if (cur_diff < best_diff) {
 			best_diff = cur_diff;
 			best_rate = cur_rate;
 		}
 
-		if (!best_diff || cur_rate < rate)
+		if (!best_diff || cur_rate < *rate)
 			break;
 	}
 
-	return best_rate;
+	*rate = best_rate;
+	return 0;
 }
 
 static int clk_sam9x5_peripheral_set_rate(struct clk_hw *hw,
diff --git a/drivers/clk/at91/clk-pll.c b/drivers/clk/at91/clk-pll.c
index 6ec79db..e7754eb 100644
--- a/drivers/clk/at91/clk-pll.c
+++ b/drivers/clk/at91/clk-pll.c
@@ -260,13 +260,19 @@  static long clk_pll_get_best_div_mul(struct clk_pll *pll, unsigned long rate,
 	return bestrate;
 }
 
-static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *parent_rate)
+static int clk_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *parent_rate)
 {
 	struct clk_pll *pll = to_clk_pll(hw);
+	long ret;
 
-	return clk_pll_get_best_div_mul(pll, rate, *parent_rate,
-					NULL, NULL, NULL);
+	ret = clk_pll_get_best_div_mul(pll, *rate, *parent_rate,
+				       NULL, NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	*rate = ret;
+	return 0;
 }
 
 static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/at91/clk-plldiv.c b/drivers/clk/at91/clk-plldiv.c
index ea22656..c267214 100644
--- a/drivers/clk/at91/clk-plldiv.c
+++ b/drivers/clk/at91/clk-plldiv.c
@@ -36,21 +36,23 @@  static unsigned long clk_plldiv_recalc_rate(struct clk_hw *hw,
 	return parent_rate;
 }
 
-static long clk_plldiv_round_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long *parent_rate)
+static int clk_plldiv_round_rate(struct clk_hw *hw, unsigned long *rate,
+				 unsigned long *parent_rate)
 {
 	unsigned long div;
 
-	if (rate > *parent_rate)
-		return *parent_rate;
-	div = *parent_rate / 2;
-	if (rate < div)
-		return div;
+	if (*rate > *parent_rate) {
+		*rate = *parent_rate;
+		return 0;
+	}
 
-	if (rate - div < *parent_rate - rate)
-		return div;
+	div = *parent_rate / 2;
+	if (*rate < div || (*rate - div) < (*parent_rate - *rate))
+		*rate = div;
+	else
+		*rate = *parent_rate;
 
-	return *parent_rate;
+	return 0;
 }
 
 static int clk_plldiv_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/at91/clk-smd.c b/drivers/clk/at91/clk-smd.c
index 144d47e..cd0f6d2 100644
--- a/drivers/clk/at91/clk-smd.c
+++ b/drivers/clk/at91/clk-smd.c
@@ -43,26 +43,32 @@  static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw,
 	return parent_rate / (smddiv + 1);
 }
 
-static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate,
-					  unsigned long *parent_rate)
+static int at91sam9x5_clk_smd_round_rate(struct clk_hw *hw,
+					 unsigned long *rate,
+					 unsigned long *parent_rate)
 {
 	unsigned long div;
 	unsigned long bestrate;
 	unsigned long tmp;
 
-	if (rate >= *parent_rate)
-		return *parent_rate;
+	if (*rate >= *parent_rate) {
+		*rate = *parent_rate;
+		return 0;
+	}
 
-	div = *parent_rate / rate;
-	if (div > SMD_MAX_DIV)
-		return *parent_rate / (SMD_MAX_DIV + 1);
+	div = *parent_rate / *rate;
+	if (div > SMD_MAX_DIV) {
+		*rate = *parent_rate / (SMD_MAX_DIV + 1);
+		return 0;
+	}
 
 	bestrate = *parent_rate / div;
 	tmp = *parent_rate / (div + 1);
-	if (bestrate - rate > rate - tmp)
+	if (bestrate - *rate > *rate - tmp)
 		bestrate = tmp;
 
-	return bestrate;
+	*rate = bestrate;
+	return 0;
 }
 
 static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index)
diff --git a/drivers/clk/at91/clk-usb.c b/drivers/clk/at91/clk-usb.c
index 0b7c3e8..08a2ee2 100644
--- a/drivers/clk/at91/clk-usb.c
+++ b/drivers/clk/at91/clk-usb.c
@@ -269,8 +269,9 @@  static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
 	return 0;
 }
 
-static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
-					  unsigned long *parent_rate)
+static int at91rm9200_clk_usb_round_rate(struct clk_hw *hw,
+					 unsigned long *rate,
+					 unsigned long *parent_rate)
 {
 	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
 	struct clk *parent = __clk_get_parent(hw->clk);
@@ -286,13 +287,13 @@  static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
 		if (!usb->divisors[i])
 			continue;
 
-		tmp_parent_rate = rate * usb->divisors[i];
+		tmp_parent_rate = *rate * usb->divisors[i];
 		tmp_parent_rate = __clk_round_rate(parent, tmp_parent_rate);
 		tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
-		if (tmprate < rate)
-			tmpdiff = rate - tmprate;
+		if (tmprate < *rate)
+			tmpdiff = *rate - tmprate;
 		else
-			tmpdiff = tmprate - rate;
+			tmpdiff = tmprate - *rate;
 
 		if (bestdiff < 0 || bestdiff > tmpdiff) {
 			bestrate = tmprate;
@@ -304,7 +305,8 @@  static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
 			break;
 	}
 
-	return bestrate;
+	*rate = bestrate;
+	return 0;
 }
 
 static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index e619285..3509d50 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -405,7 +405,7 @@  static int axi_clkgen_set_rate(struct clk_hw *clk_hw,
 	return 0;
 }
 
-static long axi_clkgen_round_rate(struct clk_hw *hw, unsigned long rate,
+static int axi_clkgen_round_rate(struct clk_hw *hw, unsigned long *rate,
 	unsigned long *parent_rate)
 {
 	unsigned int d, m, dout;
@@ -415,7 +415,8 @@  static long axi_clkgen_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (d == 0 || dout == 0 || m == 0)
 		return -EINVAL;
 
-	return *parent_rate / d * m / dout;
+	*rate = *parent_rate / d * m / dout;
+	return 0;
 }
 
 static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
diff --git a/drivers/clk/clk-cdce706.c b/drivers/clk/clk-cdce706.c
index b8e4f8a..ec9ba82 100644
--- a/drivers/clk/clk-cdce706.c
+++ b/drivers/clk/clk-cdce706.c
@@ -187,8 +187,8 @@  static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw,
 	return 0;
 }
 
-static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
-				   unsigned long *parent_rate)
+static int cdce706_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
+				  unsigned long *parent_rate)
 {
 	struct cdce706_hw_data *hwd = to_hw_data(hw);
 	unsigned long mul, div;
@@ -196,9 +196,9 @@  static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	dev_dbg(&hwd->dev_data->client->dev,
 		"%s, rate: %lu, parent_rate: %lu\n",
-		__func__, rate, *parent_rate);
+		__func__, *rate, *parent_rate);
 
-	rational_best_approximation(rate, *parent_rate,
+	rational_best_approximation(*rate, *parent_rate,
 				    CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX,
 				    &mul, &div);
 	hwd->mul = mul;
@@ -210,7 +210,8 @@  static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	res = (u64)*parent_rate * hwd->mul;
 	do_div(res, hwd->div);
-	return res;
+	*rate = res;
+	return 0;
 }
 
 static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -292,8 +293,8 @@  static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw,
 	return 0;
 }
 
-static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
-				       unsigned long *parent_rate)
+static int cdce706_divider_round_rate(struct clk_hw *hw, unsigned long *rate,
+				      unsigned long *parent_rate)
 {
 	struct cdce706_hw_data *hwd = to_hw_data(hw);
 	struct cdce706_dev_data *cdce = hwd->dev_data;
@@ -301,31 +302,31 @@  static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	dev_dbg(&hwd->dev_data->client->dev,
 		"%s, rate: %lu, parent_rate: %lu\n",
-		__func__, rate, *parent_rate);
+		__func__, *rate, *parent_rate);
 
-	rational_best_approximation(rate, *parent_rate,
+	rational_best_approximation(*rate, *parent_rate,
 				    1, CDCE706_DIVIDER_DIVIDER_MAX,
 				    &mul, &div);
 	if (!mul)
 		div = CDCE706_DIVIDER_DIVIDER_MAX;
 
 	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
-		unsigned long best_diff = rate;
+		unsigned long best_diff = *rate;
 		unsigned long best_div = 0;
 		struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent];
 		unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0;
 
-		for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff &&
-		     div <= CDCE706_PLL_FREQ_MAX / rate; ++div) {
+		for (div = CDCE706_PLL_FREQ_MIN / *rate; best_diff &&
+		     div <= CDCE706_PLL_FREQ_MAX / *rate; ++div) {
 			unsigned long n, m;
 			unsigned long diff;
 			unsigned long div_rate;
 			u64 div_rate64;
 
-			if (rate * div < CDCE706_PLL_FREQ_MIN)
+			if (*rate * div < CDCE706_PLL_FREQ_MIN)
 				continue;
 
-			rational_best_approximation(rate * div, gp_rate,
+			rational_best_approximation(*rate * div, gp_rate,
 						    CDCE706_PLL_N_MAX,
 						    CDCE706_PLL_M_MAX,
 						    &n, &m);
@@ -333,7 +334,7 @@  static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 			do_div(div_rate64, m);
 			do_div(div_rate64, div);
 			div_rate = div_rate64;
-			diff = max(div_rate, rate) - min(div_rate, rate);
+			diff = max(div_rate, *rate) - min(div_rate, *rate);
 
 			if (diff < best_diff) {
 				best_diff = diff;
@@ -348,8 +349,8 @@  static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 
 		dev_dbg(&hwd->dev_data->client->dev,
 			"%s, altering parent rate: %lu -> %lu\n",
-			__func__, *parent_rate, rate * div);
-		*parent_rate = rate * div;
+			__func__, *parent_rate, *rate * div);
+		*parent_rate = *rate * div;
 	}
 	hwd->div = div;
 
@@ -357,7 +358,8 @@  static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 		"%s, divider: %d, div: %lu\n",
 		__func__, hwd->idx, div);
 
-	return *parent_rate / div;
+	*rate = *parent_rate / div;
+	return 0;
 }
 
 static int cdce706_divider_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -425,11 +427,11 @@  static unsigned long cdce706_clkout_recalc_rate(struct clk_hw *hw,
 	return parent_rate;
 }
 
-static long cdce706_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
-				      unsigned long *parent_rate)
+static int cdce706_clkout_round_rate(struct clk_hw *hw, unsigned long *rate,
+				     unsigned long *parent_rate)
 {
-	*parent_rate = rate;
-	return rate;
+	*parent_rate = *rate;
+	return 0;
 }
 
 static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 956b7e5..f56a71d 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -68,10 +68,10 @@  static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
 	struct clk_hw *mux_hw = composite->mux_hw;
 	struct clk *parent;
 	unsigned long parent_rate;
-	long tmp_rate, best_rate = 0;
+	unsigned long tmp_rate, best_rate = 0;
 	unsigned long rate_diff;
 	unsigned long best_rate_diff = ULONG_MAX;
-	int i;
+	int ret, i;
 
 	if (rate_hw && rate_ops && rate_ops->determine_rate) {
 		__clk_hw_set_clk(rate_hw, hw);
@@ -88,8 +88,12 @@  static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
 			*best_parent_p = __clk_get_hw(parent);
 			*best_parent_rate = __clk_get_rate(parent);
 
-			return rate_ops->round_rate(rate_hw, rate,
-						    best_parent_rate);
+			ret = rate_ops->round_rate(rate_hw, &rate,
+						   best_parent_rate);
+			if (ret)
+				return ret;
+
+			return rate;
 		}
 
 		for (i = 0; i < __clk_get_num_parents(mux_hw->clk); i++) {
@@ -99,9 +103,10 @@  static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
 
 			parent_rate = __clk_get_rate(parent);
 
-			tmp_rate = rate_ops->round_rate(rate_hw, rate,
-							&parent_rate);
-			if (tmp_rate < 0)
+			tmp_rate = rate;
+			ret = rate_ops->round_rate(rate_hw, &tmp_rate,
+						   &parent_rate);
+			if (ret < 0)
 				continue;
 
 			rate_diff = abs(rate - tmp_rate);
@@ -130,8 +135,8 @@  static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
 	}
 }
 
-static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *prate)
+static int clk_composite_round_rate(struct clk_hw *hw, unsigned long *rate,
+				     unsigned long *prate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 25006a8..f646a0c 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -329,19 +329,20 @@  static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
 	return bestdiv;
 }
 
-long divider_round_rate(struct clk_hw *hw, unsigned long rate,
-			unsigned long *prate, const struct clk_div_table *table,
-			u8 width, unsigned long flags)
+int divider_round_rate(struct clk_hw *hw, unsigned long *rate,
+		       unsigned long *prate, const struct clk_div_table *table,
+		       u8 width, unsigned long flags)
 {
 	int div;
 
-	div = clk_divider_bestdiv(hw, rate, prate, table, width, flags);
+	div = clk_divider_bestdiv(hw, *rate, prate, table, width, flags);
 
-	return DIV_ROUND_UP(*prate, div);
+	*rate = DIV_ROUND_UP(*prate, div);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(divider_round_rate);
 
-static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_divider_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *prate)
 {
 	struct clk_divider *divider = to_clk_divider(hw);
@@ -352,7 +353,8 @@  static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 		bestdiv = readl(divider->reg) >> divider->shift;
 		bestdiv &= div_mask(divider->width);
 		bestdiv = _get_div(divider->table, bestdiv, divider->flags);
-		return DIV_ROUND_UP(*prate, bestdiv);
+		*rate = DIV_ROUND_UP(*prate, bestdiv);
+		return 0;
 	}
 
 	return divider_round_rate(hw, rate, prate, divider->table,
diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index d9e3f67..ff936d0 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -36,7 +36,7 @@  static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
 	return (unsigned long)rate;
 }
 
-static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_factor_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *prate)
 {
 	struct clk_fixed_factor *fix = to_clk_fixed_factor(hw);
@@ -44,12 +44,13 @@  static long clk_factor_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
 		unsigned long best_parent;
 
-		best_parent = (rate / fix->mult) * fix->div;
+		best_parent = (*rate / fix->mult) * fix->div;
 		*prate = __clk_round_rate(__clk_get_parent(hw->clk),
 				best_parent);
 	}
 
-	return (*prate / fix->div) * fix->mult;
+	*rate = (*prate / fix->div) * fix->mult;
+	return 0;
 }
 
 static int clk_factor_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c
index 6aa72d9..1f1ba3e 100644
--- a/drivers/clk/clk-fractional-divider.c
+++ b/drivers/clk/clk-fractional-divider.c
@@ -45,24 +45,26 @@  static unsigned long clk_fd_recalc_rate(struct clk_hw *hw,
 	return ret;
 }
 
-static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
-			      unsigned long *prate)
+static int clk_fd_round_rate(struct clk_hw *hw, unsigned long *rate,
+			     unsigned long *prate)
 {
 	struct clk_fractional_divider *fd = to_clk_fd(hw);
 	unsigned maxn = (fd->nmask >> fd->nshift) + 1;
 	unsigned div;
 
-	if (!rate || rate >= *prate)
-		return *prate;
+	if (!*rate || *rate >= *prate) {
+		*rate = *prate;
+		return 0;
+	}
 
-	div = gcd(*prate, rate);
+	div = gcd(*prate, *rate);
 
 	while ((*prate / div) > maxn) {
 		div <<= 1;
-		rate <<= 1;
+		*rate <<= 1;
 	}
 
-	return rate;
+	return 0;
 }
 
 static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-highbank.c b/drivers/clk/clk-highbank.c
index 2e7e9d9..f26d1b0 100644
--- a/drivers/clk/clk-highbank.c
+++ b/drivers/clk/clk-highbank.c
@@ -142,15 +142,16 @@  static void clk_pll_calc(unsigned long rate, unsigned long ref_freq,
 	*pdivf = divf;
 }
 
-static long clk_pll_round_rate(struct clk_hw *hwclk, unsigned long rate,
-			       unsigned long *parent_rate)
+static int clk_pll_round_rate(struct clk_hw *hwclk, unsigned long *rate,
+			      unsigned long *parent_rate)
 {
 	u32 divq, divf;
 	unsigned long ref_freq = *parent_rate;
 
-	clk_pll_calc(rate, ref_freq, &divq, &divf);
+	clk_pll_calc(*rate, ref_freq, &divq, &divf);
 
-	return (ref_freq * (divf + 1)) / (1 << divq);
+	*rate = (ref_freq * (divf + 1)) / (1 << divq);
+	return 0;
 }
 
 static int clk_pll_set_rate(struct clk_hw *hwclk, unsigned long rate,
@@ -239,16 +240,17 @@  static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
 	return parent_rate / div;
 }
 
-static long clk_periclk_round_rate(struct clk_hw *hwclk, unsigned long rate,
-				   unsigned long *parent_rate)
+static int clk_periclk_round_rate(struct clk_hw *hwclk, unsigned long *rate,
+				  unsigned long *parent_rate)
 {
 	u32 div;
 
-	div = *parent_rate / rate;
+	div = *parent_rate / *rate;
 	div++;
 	div &= ~0x1;
 
-	return *parent_rate / div;
+	*rate = *parent_rate / div;
+	return 0;
 }
 
 static int clk_periclk_set_rate(struct clk_hw *hwclk, unsigned long rate,
diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c
index 44ea107..54b302e 100644
--- a/drivers/clk/clk-si5351.c
+++ b/drivers/clk/clk-si5351.c
@@ -446,30 +446,30 @@  static unsigned long si5351_pll_recalc_rate(struct clk_hw *hw,
 	return (unsigned long)rate;
 }
 
-static long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *parent_rate)
+static int si5351_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
+				 unsigned long *parent_rate)
 {
 	struct si5351_hw_data *hwdata =
 		container_of(hw, struct si5351_hw_data, hw);
 	unsigned long rfrac, denom, a, b, c;
 	unsigned long long lltmp;
 
-	if (rate < SI5351_PLL_VCO_MIN)
-		rate = SI5351_PLL_VCO_MIN;
-	if (rate > SI5351_PLL_VCO_MAX)
-		rate = SI5351_PLL_VCO_MAX;
+	if (*rate < SI5351_PLL_VCO_MIN)
+		*rate = SI5351_PLL_VCO_MIN;
+	if (*rate > SI5351_PLL_VCO_MAX)
+		*rate = SI5351_PLL_VCO_MAX;
 
 	/* determine integer part of feedback equation */
-	a = rate / *parent_rate;
+	a = *rate / *parent_rate;
 
 	if (a < SI5351_PLL_A_MIN)
-		rate = *parent_rate * SI5351_PLL_A_MIN;
+		*rate = *parent_rate * SI5351_PLL_A_MIN;
 	if (a > SI5351_PLL_A_MAX)
-		rate = *parent_rate * SI5351_PLL_A_MAX;
+		*rate = *parent_rate * SI5351_PLL_A_MAX;
 
 	/* find best approximation for b/c = fVCO mod fIN */
 	denom = 1000 * 1000;
-	lltmp = rate % (*parent_rate);
+	lltmp = *rate % (*parent_rate);
 	lltmp *= denom;
 	do_div(lltmp, *parent_rate);
 	rfrac = (unsigned long)lltmp;
@@ -492,15 +492,15 @@  static long si5351_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 	lltmp *= b;
 	do_div(lltmp, c);
 
-	rate  = (unsigned long)lltmp;
-	rate += *parent_rate * a;
+	*rate  = (unsigned long)lltmp;
+	*rate += *parent_rate * a;
 
 	dev_dbg(&hwdata->drvdata->client->dev,
 		"%s - %s: a = %lu, b = %lu, c = %lu, parent_rate = %lu, rate = %lu\n",
 		__func__, __clk_get_name(hwdata->hw.clk), a, b, c,
-		*parent_rate, rate);
+		*parent_rate, *rate);
 
-	return rate;
+	return 0;
 }
 
 static int si5351_pll_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -639,8 +639,8 @@  static unsigned long si5351_msynth_recalc_rate(struct clk_hw *hw,
 	return (unsigned long)rate;
 }
 
-static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
-				     unsigned long *parent_rate)
+static int si5351_msynth_round_rate(struct clk_hw *hw, unsigned long *rate,
+				    unsigned long *parent_rate)
 {
 	struct si5351_hw_data *hwdata =
 		container_of(hw, struct si5351_hw_data, hw);
@@ -649,17 +649,17 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 	int divby4;
 
 	/* multisync6-7 can only handle freqencies < 150MHz */
-	if (hwdata->num >= 6 && rate > SI5351_MULTISYNTH67_MAX_FREQ)
-		rate = SI5351_MULTISYNTH67_MAX_FREQ;
+	if (hwdata->num >= 6 && *rate > SI5351_MULTISYNTH67_MAX_FREQ)
+		*rate = SI5351_MULTISYNTH67_MAX_FREQ;
 
 	/* multisync frequency is 1MHz .. 160MHz */
-	if (rate > SI5351_MULTISYNTH_MAX_FREQ)
-		rate = SI5351_MULTISYNTH_MAX_FREQ;
-	if (rate < SI5351_MULTISYNTH_MIN_FREQ)
-		rate = SI5351_MULTISYNTH_MIN_FREQ;
+	if (*rate > SI5351_MULTISYNTH_MAX_FREQ)
+		*rate = SI5351_MULTISYNTH_MAX_FREQ;
+	if (*rate < SI5351_MULTISYNTH_MIN_FREQ)
+		*rate = SI5351_MULTISYNTH_MIN_FREQ;
 
 	divby4 = 0;
-	if (rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
+	if (*rate > SI5351_MULTISYNTH_DIVBY4_FREQ)
 		divby4 = 1;
 
 	/* multisync can set pll */
@@ -670,7 +670,7 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 		 */
 		if (divby4 == 0) {
 			lltmp = SI5351_PLL_VCO_MAX;
-			do_div(lltmp, rate);
+			do_div(lltmp, *rate);
 			a = (unsigned long)lltmp;
 		} else
 			a = 4;
@@ -678,18 +678,18 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 		b = 0;
 		c = 1;
 
-		*parent_rate = a * rate;
+		*parent_rate = a * *rate;
 	} else {
 		unsigned long rfrac, denom;
 
 		/* disable divby4 */
 		if (divby4) {
-			rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
+			*rate = SI5351_MULTISYNTH_DIVBY4_FREQ;
 			divby4 = 0;
 		}
 
 		/* determine integer part of divider equation */
-		a = *parent_rate / rate;
+		a = *parent_rate / *rate;
 		if (a < SI5351_MULTISYNTH_A_MIN)
 			a = SI5351_MULTISYNTH_A_MIN;
 		if (hwdata->num >= 6 && a > SI5351_MULTISYNTH67_A_MAX)
@@ -699,9 +699,9 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 
 		/* find best approximation for b/c = fVCO mod fOUT */
 		denom = 1000 * 1000;
-		lltmp = (*parent_rate) % rate;
+		lltmp = (*parent_rate) % *rate;
 		lltmp *= denom;
-		do_div(lltmp, rate);
+		do_div(lltmp, *rate);
 		rfrac = (unsigned long)lltmp;
 
 		b = 0;
@@ -716,7 +716,7 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 	lltmp  = *parent_rate;
 	lltmp *= c;
 	do_div(lltmp, a * c + b);
-	rate  = (unsigned long)lltmp;
+	*rate  = (unsigned long)lltmp;
 
 	/* calculate parameters */
 	if (divby4) {
@@ -734,9 +734,9 @@  static long si5351_msynth_round_rate(struct clk_hw *hw, unsigned long rate,
 	dev_dbg(&hwdata->drvdata->client->dev,
 		"%s - %s: a = %lu, b = %lu, c = %lu, divby4 = %d, parent_rate = %lu, rate = %lu\n",
 		__func__, __clk_get_name(hwdata->hw.clk), a, b, c, divby4,
-		*parent_rate, rate);
+		*parent_rate, *rate);
 
-	return rate;
+	return 0;
 }
 
 static int si5351_msynth_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -983,57 +983,57 @@  static unsigned long si5351_clkout_recalc_rate(struct clk_hw *hw,
 	return parent_rate >> rdiv;
 }
 
-static long si5351_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
-				     unsigned long *parent_rate)
+static int si5351_clkout_round_rate(struct clk_hw *hw, unsigned long *rate,
+				    unsigned long *parent_rate)
 {
 	struct si5351_hw_data *hwdata =
 		container_of(hw, struct si5351_hw_data, hw);
 	unsigned char rdiv;
 
 	/* clkout6/7 can only handle output freqencies < 150MHz */
-	if (hwdata->num >= 6 && rate > SI5351_CLKOUT67_MAX_FREQ)
-		rate = SI5351_CLKOUT67_MAX_FREQ;
+	if (hwdata->num >= 6 && *rate > SI5351_CLKOUT67_MAX_FREQ)
+		*rate = SI5351_CLKOUT67_MAX_FREQ;
 
 	/* clkout freqency is 8kHz - 160MHz */
-	if (rate > SI5351_CLKOUT_MAX_FREQ)
-		rate = SI5351_CLKOUT_MAX_FREQ;
-	if (rate < SI5351_CLKOUT_MIN_FREQ)
-		rate = SI5351_CLKOUT_MIN_FREQ;
+	if (*rate > SI5351_CLKOUT_MAX_FREQ)
+		*rate = SI5351_CLKOUT_MAX_FREQ;
+	if (*rate < SI5351_CLKOUT_MIN_FREQ)
+		*rate = SI5351_CLKOUT_MIN_FREQ;
 
 	/* request frequency if multisync master */
 	if (__clk_get_flags(hwdata->hw.clk) & CLK_SET_RATE_PARENT) {
 		/* use r divider for frequencies below 1MHz */
 		rdiv = SI5351_OUTPUT_CLK_DIV_1;
-		while (rate < SI5351_MULTISYNTH_MIN_FREQ &&
+		while (*rate < SI5351_MULTISYNTH_MIN_FREQ &&
 		       rdiv < SI5351_OUTPUT_CLK_DIV_128) {
 			rdiv += 1;
-			rate *= 2;
+			*rate *= 2;
 		}
-		*parent_rate = rate;
+		*parent_rate = *rate;
 	} else {
 		unsigned long new_rate, new_err, err;
 
 		/* round to closed rdiv */
 		rdiv = SI5351_OUTPUT_CLK_DIV_1;
 		new_rate = *parent_rate;
-		err = abs(new_rate - rate);
+		err = abs(new_rate - *rate);
 		do {
 			new_rate >>= 1;
-			new_err = abs(new_rate - rate);
+			new_err = abs(new_rate - *rate);
 			if (new_err > err || rdiv == SI5351_OUTPUT_CLK_DIV_128)
 				break;
 			rdiv++;
 			err = new_err;
 		} while (1);
 	}
-	rate = *parent_rate >> rdiv;
+	*rate = *parent_rate >> rdiv;
 
 	dev_dbg(&hwdata->drvdata->client->dev,
 		"%s - %s: rdiv = %u, parent_rate = %lu, rate = %lu\n",
 		__func__, __clk_get_name(hwdata->hw.clk), (1 << rdiv),
-		*parent_rate, rate);
+		*parent_rate, *rate);
 
-	return rate;
+	return 0;
 }
 
 static int si5351_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c
index 20a5aec..e60a956 100644
--- a/drivers/clk/clk-si570.c
+++ b/drivers/clk/clk-si570.c
@@ -245,7 +245,7 @@  static unsigned long si570_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long si570_round_rate(struct clk_hw *hw, unsigned long rate,
+static int si570_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *parent_rate)
 {
 	int err;
@@ -253,26 +253,26 @@  static long si570_round_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned int n1, hs_div;
 	struct clk_si570 *data = to_clk_si570(hw);
 
-	if (!rate)
+	if (!*rate)
 		return 0;
 
-	if (div64_u64(abs(rate - data->frequency) * 10000LL,
+	if (div64_u64(abs(*rate - data->frequency) * 10000LL,
 				data->frequency) < 35) {
-		rfreq = div64_u64((data->rfreq * rate) +
+		rfreq = div64_u64((data->rfreq * *rate) +
 				div64_u64(data->frequency, 2), data->frequency);
 		n1 = data->n1;
 		hs_div = data->hs_div;
 
 	} else {
-		err = si570_calc_divs(rate, data, &rfreq, &n1, &hs_div);
+		err = si570_calc_divs(*rate, data, &rfreq, &n1, &hs_div);
 		if (err) {
 			dev_err(&data->i2c_client->dev,
 					"unable to round rate\n");
-			return 0;
+			*rate = 0;
 		}
 	}
 
-	return rate;
+	return 0;
 }
 
 /**
diff --git a/drivers/clk/clk-u300.c b/drivers/clk/clk-u300.c
index 406bfc1..5e3163b 100644
--- a/drivers/clk/clk-u300.c
+++ b/drivers/clk/clk-u300.c
@@ -628,22 +628,27 @@  syscon_clk_recalc_rate(struct clk_hw *hw,
 	}
 }
 
-static long
-syscon_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int
+syscon_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 		      unsigned long *prate)
 {
 	struct clk_syscon *sclk = to_syscon(hw);
 
-	if (sclk->clk_val != U300_SYSCON_SBCER_CPU_CLK_EN)
-		return *prate;
+	if (sclk->clk_val != U300_SYSCON_SBCER_CPU_CLK_EN) {
+		*rate = *prate;
+		return 0;
+	}
 	/* We really only support setting the rate of the CPU clock */
-	if (rate <= 13000000)
-		return 13000000;
-	if (rate <= 52000000)
-		return 52000000;
-	if (rate <= 104000000)
-		return 104000000;
-	return 208000000;
+	if (*rate <= 13000000)
+		*rate = 13000000;
+	else if (*rate <= 52000000)
+		*rate = 52000000;
+	else if (*rate <= 104000000)
+		*rate = 104000000;
+	else
+		*rate = 208000000;
+
+	return 0;
 }
 
 static int syscon_clk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -1037,26 +1042,28 @@  mclk_clk_recalc_rate(struct clk_hw *hw,
 	return parent_rate;
 }
 
-static long
-mclk_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int
+mclk_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 		    unsigned long *prate)
 {
-	if (rate <= 18900000)
-		return 18900000;
-	if (rate <= 20800000)
-		return 20800000;
-	if (rate <= 23100000)
-		return 23100000;
-	if (rate <= 26000000)
-		return 26000000;
-	if (rate <= 29700000)
-		return 29700000;
-	if (rate <= 34700000)
-		return 34700000;
-	if (rate <= 41600000)
-		return 41600000;
-	/* Highest rate */
-	return 52000000;
+	if (*rate <= 18900000)
+		*rate = 18900000;
+	else if (*rate <= 20800000)
+		*rate = 20800000;
+	else if (*rate <= 23100000)
+		*rate = 23100000;
+	else if (*rate <= 26000000)
+		*rate = 26000000;
+	else if (*rate <= 29700000)
+		*rate = 29700000;
+	else if (*rate <= 34700000)
+		*rate = 34700000;
+	else if (*rate <= 41600000)
+		*rate = 41600000;
+	else
+		*rate = 52000000;
+
+	return 0;
 }
 
 static int mclk_clk_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c
index 37e9288..221eec3 100644
--- a/drivers/clk/clk-vt8500.c
+++ b/drivers/clk/clk-vt8500.c
@@ -137,19 +137,19 @@  static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
 	return parent_rate / div;
 }
 
-static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *prate)
 {
 	struct clk_device *cdev = to_clk_device(hw);
 	u32 divisor;
 
-	if (rate == 0)
+	if (*rate == 0)
 		return 0;
 
-	divisor = *prate / rate;
+	divisor = *prate / *rate;
 
 	/* If prate / rate would be decimal, incr the divisor */
-	if (rate * divisor < *prate)
+	if (*rate * divisor < *prate)
 		divisor++;
 
 	/*
@@ -160,7 +160,8 @@  static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
 		divisor = 64 * ((divisor / 64) + 1);
 	}
 
-	return *prate / divisor;
+	*rate = *prate / divisor;
+	return 0;
 }
 
 static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -579,8 +580,8 @@  static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }
 
-static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
-				unsigned long *prate)
+static int vtwm_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
+			       unsigned long *prate)
 {
 	struct clk_pll *pll = to_clk_pll(hw);
 	u32 filter, mul, div1, div2;
@@ -588,26 +589,28 @@  static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	switch (pll->type) {
 	case PLL_TYPE_VT8500:
-		vt8500_find_pll_bits(rate, *prate, &mul, &div1);
+		vt8500_find_pll_bits(*rate, *prate, &mul, &div1);
 		round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
 		break;
 	case PLL_TYPE_WM8650:
-		wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+		wm8650_find_pll_bits(*rate, *prate, &mul, &div1, &div2);
 		round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
 		break;
 	case PLL_TYPE_WM8750:
-		wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
+		wm8750_find_pll_bits(*rate, *prate, &filter, &mul, &div1,
+				     &div2);
 		round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
 		break;
 	case PLL_TYPE_WM8850:
-		wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+		wm8850_find_pll_bits(*rate, *prate, &mul, &div1, &div2);
 		round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
 		break;
 	default:
 		round_rate = 0;
 	}
 
-	return round_rate;
+	*rate = round_rate;
+	return 0;
 }
 
 static unsigned long vtwm_pll_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/clk-wm831x.c b/drivers/clk/clk-wm831x.c
index ef67719..23db1b5 100644
--- a/drivers/clk/clk-wm831x.c
+++ b/drivers/clk/clk-wm831x.c
@@ -142,18 +142,19 @@  static unsigned long wm831x_fll_recalc_rate(struct clk_hw *hw,
 	return 0;
 }
 
-static long wm831x_fll_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *unused)
+static int wm831x_fll_round_rate(struct clk_hw *hw, unsigned long *rate,
+				 unsigned long *unused)
 {
 	int best = 0;
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(wm831x_fll_auto_rates); i++)
-		if (abs(wm831x_fll_auto_rates[i] - rate) <
-		    abs(wm831x_fll_auto_rates[best] - rate))
+		if (abs(wm831x_fll_auto_rates[i] - *rate) <
+		    abs(wm831x_fll_auto_rates[best] - *rate))
 			best = i;
 
-	return wm831x_fll_auto_rates[best];
+	*rate = wm831x_fll_auto_rates[best];
+	return 0;
 }
 
 static int wm831x_fll_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/clk-xgene.c b/drivers/clk/clk-xgene.c
index dd8a62d..27460e3 100644
--- a/drivers/clk/clk-xgene.c
+++ b/drivers/clk/clk-xgene.c
@@ -367,7 +367,7 @@  static int xgene_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 	return parent_rate / divider_save;
 }
 
-static long xgene_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int xgene_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *prate)
 {
 	struct xgene_clk *pclk = to_xgene_clk(hw);
@@ -376,14 +376,15 @@  static long xgene_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 
 	if (pclk->param.divider_reg) {
 		/* Let's compute the divider */
-		if (rate > parent_rate)
-			rate = parent_rate;
-		divider = parent_rate / rate;   /* Rounded down */
+		if (*rate > parent_rate)
+			*rate = parent_rate;
+		divider = parent_rate / *rate;   /* Rounded down */
 	} else {
 		divider = 1;
 	}
 
-	return parent_rate / divider;
+	*rate = parent_rate / divider;
+	return 0;
 }
 
 const struct clk_ops xgene_clk_ops = {
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 459ce9d..6039bd2 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1146,9 +1146,12 @@  static unsigned long clk_core_round_rate_nolock(struct clk_core *clk,
 		return clk->ops->determine_rate(clk->hw, rate,
 						min_rate, max_rate,
 						&parent_rate, &parent_hw);
-	} else if (clk->ops->round_rate)
-		return clk->ops->round_rate(clk->hw, rate, &parent_rate);
-	else if (clk->flags & CLK_SET_RATE_PARENT)
+	} else if (clk->ops->round_rate) {
+		if (clk->ops->round_rate(clk->hw, &rate, &parent_rate))
+			return 0;
+
+		return rate;
+	} else if (clk->flags & CLK_SET_RATE_PARENT)
 		return clk_core_round_rate_nolock(clk->parent, rate, min_rate,
 						  max_rate);
 	else
@@ -1614,7 +1617,7 @@  static struct clk_core *clk_calc_new_rates(struct clk_core *clk,
 	struct clk_core *old_parent, *parent;
 	struct clk_hw *parent_hw;
 	unsigned long best_parent_rate = 0;
-	unsigned long new_rate;
+	unsigned long new_rate = rate;
 	unsigned long min_rate;
 	unsigned long max_rate;
 	int p_index = 0;
@@ -1645,12 +1648,11 @@  static struct clk_core *clk_calc_new_rates(struct clk_core *clk,
 		new_rate = ret;
 		parent = parent_hw ? parent_hw->core : NULL;
 	} else if (clk->ops->round_rate) {
-		ret = clk->ops->round_rate(clk->hw, rate,
+		ret = clk->ops->round_rate(clk->hw, &new_rate,
 					   &best_parent_rate);
 		if (ret < 0)
 			return NULL;
 
-		new_rate = ret;
 		if (new_rate < min_rate || new_rate > max_rate)
 			return NULL;
 	} else if (!parent || !(clk->flags & CLK_SET_RATE_PARENT)) {
diff --git a/drivers/clk/mmp/clk-frac.c b/drivers/clk/mmp/clk-frac.c
index 584a992..6652983 100644
--- a/drivers/clk/mmp/clk-frac.c
+++ b/drivers/clk/mmp/clk-frac.c
@@ -24,7 +24,7 @@ 
 
 #define to_clk_factor(hw) container_of(hw, struct mmp_clk_factor, hw)
 
-static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_factor_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *prate)
 {
 	struct mmp_clk_factor *factor = to_clk_factor(hw);
@@ -35,17 +35,19 @@  static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
 		prev_rate = rate;
 		rate = (((*prate / 10000) * factor->ftbl[i].den) /
 			(factor->ftbl[i].num * factor->masks->factor)) * 10000;
-		if (rate > drate)
+		if (rate > *drate)
 			break;
 	}
 	if ((i == 0) || (i == factor->ftbl_cnt)) {
-		return rate;
+		*drate = rate;
 	} else {
-		if ((drate - prev_rate) > (rate - drate))
-			return rate;
+		if ((*drate - prev_rate) > (rate - *drate))
+			*drate = rate;
 		else
-			return prev_rate;
+			*drate = prev_rate;
 	}
+
+	return 0;
 }
 
 static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/mvebu/clk-corediv.c b/drivers/clk/mvebu/clk-corediv.c
index d1e5863..c5aee2f 100644
--- a/drivers/clk/mvebu/clk-corediv.c
+++ b/drivers/clk/mvebu/clk-corediv.c
@@ -132,19 +132,20 @@  static unsigned long clk_corediv_recalc_rate(struct clk_hw *hwclk,
 	return parent_rate / div;
 }
 
-static long clk_corediv_round_rate(struct clk_hw *hwclk, unsigned long rate,
+static int clk_corediv_round_rate(struct clk_hw *hwclk, unsigned long *rate,
 			       unsigned long *parent_rate)
 {
 	/* Valid ratio are 1:4, 1:5, 1:6 and 1:8 */
 	u32 div;
 
-	div = *parent_rate / rate;
+	div = *parent_rate / *rate;
 	if (div < 4)
 		div = 4;
 	else if (div > 6)
 		div = 8;
 
-	return *parent_rate / div;
+	*rate = *parent_rate / div;
+	return 0;
 }
 
 static int clk_corediv_set_rate(struct clk_hw *hwclk, unsigned long rate,
diff --git a/drivers/clk/mvebu/clk-cpu.c b/drivers/clk/mvebu/clk-cpu.c
index 3821a88..0279b50 100644
--- a/drivers/clk/mvebu/clk-cpu.c
+++ b/drivers/clk/mvebu/clk-cpu.c
@@ -57,19 +57,20 @@  static unsigned long clk_cpu_recalc_rate(struct clk_hw *hwclk,
 	return parent_rate / div;
 }
 
-static long clk_cpu_round_rate(struct clk_hw *hwclk, unsigned long rate,
-			       unsigned long *parent_rate)
+static int clk_cpu_round_rate(struct clk_hw *hwclk, unsigned long *rate,
+			      unsigned long *parent_rate)
 {
 	/* Valid ratio are 1:1, 1:2 and 1:3 */
 	u32 div;
 
-	div = *parent_rate / rate;
+	div = *parent_rate / *rate;
 	if (div == 0)
 		div = 1;
 	else if (div > 3)
 		div = 3;
 
-	return *parent_rate / div;
+	*rate = *parent_rate / div;
+	return 0;
 }
 
 static int clk_cpu_off_set_rate(struct clk_hw *hwclk, unsigned long rate,
diff --git a/drivers/clk/mxs/clk-div.c b/drivers/clk/mxs/clk-div.c
index 90e1da9..3677e51 100644
--- a/drivers/clk/mxs/clk-div.c
+++ b/drivers/clk/mxs/clk-div.c
@@ -47,8 +47,8 @@  static unsigned long clk_div_recalc_rate(struct clk_hw *hw,
 	return div->ops->recalc_rate(&div->divider.hw, parent_rate);
 }
 
-static long clk_div_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *prate)
+static int clk_div_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *prate)
 {
 	struct clk_div *div = to_clk_div(hw);
 
diff --git a/drivers/clk/mxs/clk-frac.c b/drivers/clk/mxs/clk-frac.c
index e6aa6b5..86fc3bb 100644
--- a/drivers/clk/mxs/clk-frac.c
+++ b/drivers/clk/mxs/clk-frac.c
@@ -49,18 +49,18 @@  static unsigned long clk_frac_recalc_rate(struct clk_hw *hw,
 	return (parent_rate >> frac->width) * div;
 }
 
-static long clk_frac_round_rate(struct clk_hw *hw, unsigned long rate,
-				unsigned long *prate)
+static int clk_frac_round_rate(struct clk_hw *hw, unsigned long *rate,
+			       unsigned long *prate)
 {
 	struct clk_frac *frac = to_clk_frac(hw);
 	unsigned long parent_rate = *prate;
 	u32 div;
 	u64 tmp;
 
-	if (rate > parent_rate)
+	if (*rate > parent_rate)
 		return -EINVAL;
 
-	tmp = rate;
+	tmp = *rate;
 	tmp <<= frac->width;
 	do_div(tmp, parent_rate);
 	div = tmp;
@@ -68,7 +68,8 @@  static long clk_frac_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (!div)
 		return -EINVAL;
 
-	return (parent_rate >> frac->width) * div;
+	*rate = (parent_rate >> frac->width) * div;
+	return 0;
 }
 
 static int clk_frac_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/mxs/clk-ref.c b/drivers/clk/mxs/clk-ref.c
index 4adeed6..e0d6529 100644
--- a/drivers/clk/mxs/clk-ref.c
+++ b/drivers/clk/mxs/clk-ref.c
@@ -64,15 +64,15 @@  static unsigned long clk_ref_recalc_rate(struct clk_hw *hw,
 	return tmp;
 }
 
-static long clk_ref_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *prate)
+static int clk_ref_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *prate)
 {
 	unsigned long parent_rate = *prate;
 	u64 tmp = parent_rate;
 	u8 frac;
 
-	tmp = tmp * 18 + rate / 2;
-	do_div(tmp, rate);
+	tmp = tmp * 18 + *rate / 2;
+	do_div(tmp, *rate);
 	frac = tmp;
 
 	if (frac < 18)
@@ -83,8 +83,9 @@  static long clk_ref_round_rate(struct clk_hw *hw, unsigned long rate,
 	tmp = parent_rate;
 	tmp *= 18;
 	do_div(tmp, frac);
+	*rate = tmp;
 
-	return tmp;
+	return 0;
 }
 
 static int clk_ref_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/qcom/clk-regmap-divider.c b/drivers/clk/qcom/clk-regmap-divider.c
index 5348491..1720da4 100644
--- a/drivers/clk/qcom/clk-regmap-divider.c
+++ b/drivers/clk/qcom/clk-regmap-divider.c
@@ -23,8 +23,8 @@  static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)
 	return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);
 }
 
-static long div_round_rate(struct clk_hw *hw, unsigned long rate,
-			   unsigned long *prate)
+static int div_round_rate(struct clk_hw *hw, unsigned long *rate,
+			  unsigned long *prate)
 {
 	struct clk_regmap_div *divider = to_clk_regmap_div(hw);
 
diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index f8d3baf..bd408ef 100644
--- a/drivers/clk/rockchip/clk-pll.c
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -63,8 +63,8 @@  static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
 	return NULL;
 }
 
-static long rockchip_pll_round_rate(struct clk_hw *hw,
-			    unsigned long drate, unsigned long *prate)
+static int rockchip_pll_round_rate(struct clk_hw *hw,
+			    unsigned long *drate, unsigned long *prate)
 {
 	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
 	const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
@@ -72,12 +72,15 @@  static long rockchip_pll_round_rate(struct clk_hw *hw,
 
 	/* Assumming rate_table is in descending order */
 	for (i = 0; i < pll->rate_count; i++) {
-		if (drate >= rate_table[i].rate)
-			return rate_table[i].rate;
+		if (*drate >= rate_table[i].rate) {
+			*drate = rate_table[i].rate;
+			return 0;
+		}
 	}
 
 	/* return minimum supported value */
-	return rate_table[i - 1].rate;
+	*drate = rate_table[i - 1].rate;
+	return 0;
 }
 
 /*
diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
index 9d70e5c..0128de2 100644
--- a/drivers/clk/samsung/clk-pll.c
+++ b/drivers/clk/samsung/clk-pll.c
@@ -42,8 +42,8 @@  static const struct samsung_pll_rate_table *samsung_get_pll_settings(
 	return NULL;
 }
 
-static long samsung_pll_round_rate(struct clk_hw *hw,
-			unsigned long drate, unsigned long *prate)
+static int samsung_pll_round_rate(struct clk_hw *hw,
+			unsigned long *drate, unsigned long *prate)
 {
 	struct samsung_clk_pll *pll = to_clk_pll(hw);
 	const struct samsung_pll_rate_table *rate_table = pll->rate_table;
@@ -51,12 +51,15 @@  static long samsung_pll_round_rate(struct clk_hw *hw,
 
 	/* Assumming rate_table is in descending order */
 	for (i = 0; i < pll->rate_count; i++) {
-		if (drate >= rate_table[i].rate)
-			return rate_table[i].rate;
+		if (*drate >= rate_table[i].rate) {
+			*drate = rate_table[i].rate;
+			return 0;
+		}
 	}
 
 	/* return minimum supported value */
-	return rate_table[i - 1].rate;
+	*drate = rate_table[i - 1].rate;
+	return 0;
 }
 
 /*
diff --git a/drivers/clk/shmobile/clk-div6.c b/drivers/clk/shmobile/clk-div6.c
index 036a692..d31ae3d 100644
--- a/drivers/clk/shmobile/clk-div6.c
+++ b/drivers/clk/shmobile/clk-div6.c
@@ -97,12 +97,13 @@  static unsigned int cpg_div6_clock_calc_div(unsigned long rate,
 	return clamp_t(unsigned int, div, 1, 64);
 }
 
-static long cpg_div6_clock_round_rate(struct clk_hw *hw, unsigned long rate,
+static int cpg_div6_clock_round_rate(struct clk_hw *hw, unsigned long *rate,
 				      unsigned long *parent_rate)
 {
-	unsigned int div = cpg_div6_clock_calc_div(rate, *parent_rate);
+	unsigned int div = cpg_div6_clock_calc_div(*rate, *parent_rate);
 
-	return *parent_rate / div;
+	*rate = *parent_rate / div;
+	return 0;
 }
 
 static int cpg_div6_clock_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/shmobile/clk-rcar-gen2.c b/drivers/clk/shmobile/clk-rcar-gen2.c
index acfb6d7..57581a9 100644
--- a/drivers/clk/shmobile/clk-rcar-gen2.c
+++ b/drivers/clk/shmobile/clk-rcar-gen2.c
@@ -68,8 +68,8 @@  static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw,
 	return div_u64((u64)parent_rate * mult, 32);
 }
 
-static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate,
-				 unsigned long *parent_rate)
+static int cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
+				unsigned long *parent_rate)
 {
 	unsigned long prate  = *parent_rate;
 	unsigned int mult;
@@ -77,10 +77,11 @@  static long cpg_z_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (!prate)
 		prate = 1;
 
-	mult = div_u64((u64)rate * 32, prate);
+	mult = div_u64((u64)*rate * 32, prate);
 	mult = clamp(mult, 1U, 32U);
 
-	return *parent_rate / 32 * mult;
+	*rate = *parent_rate / 32 * mult;
+	return 0;
 }
 
 static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/sirf/clk-common.c b/drivers/clk/sirf/clk-common.c
index 37af51c..68a7889 100644
--- a/drivers/clk/sirf/clk-common.c
+++ b/drivers/clk/sirf/clk-common.c
@@ -91,7 +91,7 @@  static unsigned long pll_clk_recalc_rate(struct clk_hw *hw,
 	}
 }
 
-static long pll_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int pll_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 	unsigned long *parent_rate)
 {
 	unsigned long fin, nf, nr, od;
@@ -101,9 +101,9 @@  static long pll_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	 * fout = fin * nf / (nr * od);
 	 * set od = 1, nr = fin/MHz, so fout = nf * MHz
 	 */
-	rate = rate - rate % MHZ;
+	*rate = *rate - *rate % MHZ;
 
-	nf = rate / MHZ;
+	nf = *rate / MHZ;
 	if (nf > BIT(13))
 		nf = BIT(13);
 	if (nf < 1)
@@ -119,7 +119,8 @@  static long pll_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	dividend = (u64)fin * nf;
 	do_div(dividend, nr * od);
 
-	return (long)dividend;
+	*rate = dividend;
+	return 0;
 }
 
 static int pll_clk_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -158,7 +159,7 @@  static int pll_clk_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }
 
-static long cpu_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int cpu_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 	unsigned long *parent_rate)
 {
 	/*
@@ -347,7 +348,7 @@  static unsigned long dmn_clk_recalc_rate(struct clk_hw *hw,
 	}
 }
 
-static long dmn_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int dmn_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
 	unsigned long *parent_rate)
 {
 	unsigned long fin;
@@ -355,7 +356,7 @@  static long dmn_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	unsigned bits = (strcmp(hw->init->name, "mem") == 0) ? 3 : 4;
 
 	fin = *parent_rate;
-	ratio = fin / rate;
+	ratio = fin / *rate;
 
 	if (ratio < 2)
 		ratio = 2;
@@ -365,7 +366,8 @@  static long dmn_clk_round_rate(struct clk_hw *hw, unsigned long rate,
 	wait = (ratio >> 1) - 1;
 	hold = ratio - wait - 2;
 
-	return fin / (wait + hold + 2);
+	*rate = fin / (wait + hold + 2);
+	return 0;
 }
 
 static int dmn_clk_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/spear/clk-aux-synth.c b/drivers/clk/spear/clk-aux-synth.c
index bdfb442..1a93f6a 100644
--- a/drivers/clk/spear/clk-aux-synth.c
+++ b/drivers/clk/spear/clk-aux-synth.c
@@ -52,14 +52,20 @@  static unsigned long aux_calc_rate(struct clk_hw *hw, unsigned long prate,
 			(rtbl[index].yscale * eq)) * 10000;
 }
 
-static long clk_aux_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_aux_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *prate)
 {
 	struct clk_aux *aux = to_clk_aux(hw);
 	int unused;
+	long ret;
 
-	return clk_round_rate_index(hw, drate, *prate, aux_calc_rate,
+	ret = clk_round_rate_index(hw, *drate, *prate, aux_calc_rate,
 			aux->rtbl_cnt, &unused);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+	return 0;
 }
 
 static unsigned long clk_aux_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/spear/clk-frac-synth.c b/drivers/clk/spear/clk-frac-synth.c
index dffd4ce..d4098c8 100644
--- a/drivers/clk/spear/clk-frac-synth.c
+++ b/drivers/clk/spear/clk-frac-synth.c
@@ -55,14 +55,20 @@  static unsigned long frac_calc_rate(struct clk_hw *hw, unsigned long prate,
 	return prate;
 }
 
-static long clk_frac_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_frac_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *prate)
 {
 	struct clk_frac *frac = to_clk_frac(hw);
 	int unused;
+	long ret;
 
-	return clk_round_rate_index(hw, drate, *prate, frac_calc_rate,
+	ret = clk_round_rate_index(hw, *drate, *prate, frac_calc_rate,
 			frac->rtbl_cnt, &unused);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+	return 0;
 }
 
 static unsigned long clk_frac_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/spear/clk-gpt-synth.c b/drivers/clk/spear/clk-gpt-synth.c
index 1afc18c..ea3328b 100644
--- a/drivers/clk/spear/clk-gpt-synth.c
+++ b/drivers/clk/spear/clk-gpt-synth.c
@@ -42,14 +42,20 @@  static unsigned long gpt_calc_rate(struct clk_hw *hw, unsigned long prate,
 	return prate;
 }
 
-static long clk_gpt_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_gpt_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *prate)
 {
 	struct clk_gpt *gpt = to_clk_gpt(hw);
 	int unused;
+	long ret;
 
-	return clk_round_rate_index(hw, drate, *prate, gpt_calc_rate,
+	ret = clk_round_rate_index(hw, *drate, *prate, gpt_calc_rate,
 			gpt->rtbl_cnt, &unused);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+	return 0;
 }
 
 static unsigned long clk_gpt_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/spear/clk-vco-pll.c b/drivers/clk/spear/clk-vco-pll.c
index 1b9b65b..08b1411 100644
--- a/drivers/clk/spear/clk-vco-pll.c
+++ b/drivers/clk/spear/clk-vco-pll.c
@@ -113,12 +113,18 @@  static long clk_pll_round_rate_index(struct clk_hw *hw, unsigned long drate,
 	return rate;
 }
 
-static long clk_pll_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_pll_round_rate(struct clk_hw *hw, unsigned long *drate,
 				unsigned long *prate)
 {
 	int unused;
+	long ret;
 
-	return clk_pll_round_rate_index(hw, drate, prate, &unused);
+	ret = clk_pll_round_rate_index(hw, *drate, prate, &unused);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+	return 0;
 }
 
 static unsigned long clk_pll_recalc_rate(struct clk_hw *hw, unsigned long
@@ -179,14 +185,20 @@  static inline unsigned long vco_calc_rate(struct clk_hw *hw,
 	return pll_calc_rate(vco->rtbl, prate, index, NULL);
 }
 
-static long clk_vco_round_rate(struct clk_hw *hw, unsigned long drate,
+static int clk_vco_round_rate(struct clk_hw *hw, unsigned long *drate,
 		unsigned long *prate)
 {
 	struct clk_vco *vco = to_clk_vco(hw);
 	int unused;
+	long ret;
 
-	return clk_round_rate_index(hw, drate, *prate, vco_calc_rate,
+	ret = clk_round_rate_index(hw, *drate, *prate, vco_calc_rate,
 			vco->rtbl_cnt, &unused);
+	if (ret < 0)
+		return ret;
+
+	*drate = ret;
+	return 0;
 }
 
 static unsigned long clk_vco_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index bf12a25..d04278b 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -100,20 +100,21 @@  clk_best_div(unsigned long parent_rate, unsigned long rate)
 	return parent_rate / rate + ((rate > (2*(parent_rate % rate))) ? 0 : 1);
 }
 
-static long flexgen_round_rate(struct clk_hw *hw, unsigned long rate,
+static int flexgen_round_rate(struct clk_hw *hw, unsigned long *rate,
 				   unsigned long *prate)
 {
 	unsigned long div;
 
 	/* Round div according to exact prate and wished rate */
-	div = clk_best_div(*prate, rate);
+	div = clk_best_div(*prate, *rate);
 
 	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
-		*prate = rate * div;
-		return rate;
+		*prate = *rate * div;
+		return 0;
 	}
 
-	return *prate / div;
+	*rate = *prate / div;
+	return 0;
 }
 
 unsigned long flexgen_recalc_rate(struct clk_hw *hw,
diff --git a/drivers/clk/st/clkgen-fsyn.c b/drivers/clk/st/clkgen-fsyn.c
index a917c4c..f50d571 100644
--- a/drivers/clk/st/clkgen-fsyn.c
+++ b/drivers/clk/st/clkgen-fsyn.c
@@ -548,21 +548,22 @@  int clk_fs660c32_vco_get_params(unsigned long input,
 	return 0;
 }
 
-static long quadfs_pll_fs660c32_round_rate(struct clk_hw *hw, unsigned long rate
-		, unsigned long *prate)
+static int quadfs_pll_fs660c32_round_rate(struct clk_hw *hw,
+					  unsigned long *rate,
+					  unsigned long *prate)
 {
 	struct stm_fs params;
 
-	if (!clk_fs660c32_vco_get_params(*prate, rate, &params))
-		clk_fs660c32_vco_get_rate(*prate, &params, &rate);
+	if (!clk_fs660c32_vco_get_params(*prate, *rate, &params))
+		clk_fs660c32_vco_get_rate(*prate, &params, rate);
 
 	pr_debug("%s: %s new rate %ld [sdiv=0x%x,md=0x%x,pe=0x%x,nsdiv3=%u]\n",
 		 __func__, __clk_get_name(hw->clk),
-		 rate, (unsigned int)params.sdiv,
+		 *rate, (unsigned int)params.sdiv,
 		 (unsigned int)params.mdiv,
 		 (unsigned int)params.pe, (unsigned int)params.nsdiv);
 
-	return rate;
+	return 0;
 }
 
 static int quadfs_pll_fs660c32_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -953,19 +954,19 @@  static unsigned long quadfs_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long quadfs_round_rate(struct clk_hw *hw, unsigned long rate,
+static int quadfs_round_rate(struct clk_hw *hw, unsigned long *rate,
 				     unsigned long *prate)
 {
 	struct stm_fs params;
 
-	rate = quadfs_find_best_rate(hw, rate, *prate, &params);
+	*rate = quadfs_find_best_rate(hw, *rate, *prate, &params);
 
 	pr_debug("%s: %s new rate %ld [sdiv=0x%x,md=0x%x,pe=0x%x,nsdiv3=%u]\n",
 		 __func__, __clk_get_name(hw->clk),
-		 rate, (unsigned int)params.sdiv, (unsigned int)params.mdiv,
+		 *rate, (unsigned int)params.sdiv, (unsigned int)params.mdiv,
 			 (unsigned int)params.pe, (unsigned int)params.nsdiv);
 
-	return rate;
+	return 0;
 }
 
 
diff --git a/drivers/clk/st/clkgen-mux.c b/drivers/clk/st/clkgen-mux.c
index fdcff10..7a42b6c 100644
--- a/drivers/clk/st/clkgen-mux.c
+++ b/drivers/clk/st/clkgen-mux.c
@@ -190,7 +190,7 @@  static int clkgena_divmux_set_rate(struct clk_hw *hw, unsigned long rate,
 	return clk_divider_ops.set_rate(div_hw, rate, parent_rate);
 }
 
-static long clkgena_divmux_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clkgena_divmux_round_rate(struct clk_hw *hw, unsigned long *rate,
 				   unsigned long *prate)
 {
 	struct clkgena_divmux *genamux = to_clkgena_divmux(hw);
diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index 8c20190..5865300 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -69,14 +69,17 @@  static unsigned long clk_factors_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long clk_factors_round_rate(struct clk_hw *hw, unsigned long rate,
-				   unsigned long *parent_rate)
+static int clk_factors_round_rate(struct clk_hw *hw, unsigned long *rate,
+				  unsigned long *parent_rate)
 {
 	struct clk_factors *factors = to_clk_factors(hw);
-	factors->get_factors((u32 *)&rate, (u32)*parent_rate,
+	u32 tmp_rate = *rate;
+
+	factors->get_factors(&tmp_rate, (u32)*parent_rate,
 			     NULL, NULL, NULL, NULL);
 
-	return rate;
+	*rate = tmp_rate;
+	return 0;
 }
 
 static long clk_factors_determine_rate(struct clk_hw *hw, unsigned long rate,
@@ -100,7 +103,8 @@  static long clk_factors_determine_rate(struct clk_hw *hw, unsigned long rate,
 		else
 			parent_rate = __clk_get_rate(parent);
 
-		child_rate = clk_factors_round_rate(hw, rate, &parent_rate);
+		child_rate = rate;
+		clk_factors_round_rate(hw, &child_rate, &parent_rate);
 
 		if (child_rate <= rate && child_rate > best_child_rate) {
 			best_parent = parent;
diff --git a/drivers/clk/tegra/clk-audio-sync.c b/drivers/clk/tegra/clk-audio-sync.c
index c0f7843..0224256 100644
--- a/drivers/clk/tegra/clk-audio-sync.c
+++ b/drivers/clk/tegra/clk-audio-sync.c
@@ -28,15 +28,15 @@  static unsigned long clk_sync_source_recalc_rate(struct clk_hw *hw,
 	return sync->rate;
 }
 
-static long clk_sync_source_round_rate(struct clk_hw *hw, unsigned long rate,
-				       unsigned long *prate)
+static int clk_sync_source_round_rate(struct clk_hw *hw, unsigned long *rate,
+				      unsigned long *prate)
 {
 	struct tegra_clk_sync_source *sync = to_clk_sync_source(hw);
 
-	if (rate > sync->max_rate)
+	if (*rate > sync->max_rate)
 		return -EINVAL;
 	else
-		return rate;
+		return 0;
 }
 
 static int clk_sync_source_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c
index 59a5714..9e5ca82 100644
--- a/drivers/clk/tegra/clk-divider.c
+++ b/drivers/clk/tegra/clk-divider.c
@@ -85,23 +85,28 @@  static unsigned long clk_frac_div_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long clk_frac_div_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_frac_div_round_rate(struct clk_hw *hw, unsigned long *rate,
 				   unsigned long *prate)
 {
 	struct tegra_clk_frac_div *divider = to_clk_frac_div(hw);
 	int div, mul;
 	unsigned long output_rate = *prate;
 
-	if (!rate)
-		return output_rate;
+	if (!*rate) {
+		*rate = output_rate;
+		return 0;
+	}
 
-	div = get_div(divider, rate, output_rate);
-	if (div < 0)
-		return *prate;
+	div = get_div(divider, *rate, output_rate);
+	if (div < 0) {
+		*rate = *prate;
+		return 0;
+	}
 
 	mul = get_mul(divider);
 
-	return DIV_ROUND_UP(output_rate * mul, div + mul);
+	*rate = DIV_ROUND_UP(output_rate * mul, div + mul);
+	return 0;
 }
 
 static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
index d84ae49..5a262f5 100644
--- a/drivers/clk/tegra/clk-periph.c
+++ b/drivers/clk/tegra/clk-periph.c
@@ -56,8 +56,8 @@  static unsigned long clk_periph_recalc_rate(struct clk_hw *hw,
 	return div_ops->recalc_rate(div_hw, parent_rate);
 }
 
-static long clk_periph_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *prate)
+static int clk_periph_round_rate(struct clk_hw *hw, unsigned long *rate,
+				 unsigned long *prate)
 {
 	struct tegra_clk_periph *periph = to_clk_periph(hw);
 	const struct clk_ops *div_ops = periph->div_ops;
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 05c6d08..40ff3c5 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -623,24 +623,29 @@  static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 	return ret;
 }
 
-static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
 			unsigned long *prate)
 {
 	struct tegra_clk_pll *pll = to_clk_pll(hw);
 	struct tegra_clk_pll_freq_table cfg;
 
-	if (pll->params->flags & TEGRA_PLL_FIXED)
-		return pll->params->fixed_rate;
+	if (pll->params->flags & TEGRA_PLL_FIXED) {
+		*rate = pll->params->fixed_rate;
+		return 0;
+	}
 
 	/* PLLM is used for memory; we do not change rate */
-	if (pll->params->flags & TEGRA_PLLM)
-		return __clk_get_rate(hw->clk);
+	if (pll->params->flags & TEGRA_PLLM) {
+		*rate = __clk_get_rate(hw->clk);
+		return 0;
+	}
 
-	if (_get_table_rate(hw, &cfg, rate, *prate) &&
-	    _calc_rate(hw, &cfg, rate, *prate))
+	if (_get_table_rate(hw, &cfg, *rate, *prate) &&
+	    _calc_rate(hw, &cfg, *rate, *prate))
 		return -EINVAL;
 
-	return cfg.output_rate;
+	*rate = cfg.output_rate;
+	return 0;
 }
 
 static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
@@ -1001,25 +1006,28 @@  static int clk_pllxc_set_rate(struct clk_hw *hw, unsigned long rate,
 	return ret;
 }
 
-static long clk_pll_ramp_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_pll_ramp_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *prate)
 {
 	struct tegra_clk_pll_freq_table cfg;
 	int ret, p_div;
 	u64 output_rate = *prate;
 
-	ret = _pll_ramp_calc_pll(hw, &cfg, rate, *prate);
+	ret = _pll_ramp_calc_pll(hw, &cfg, *rate, *prate);
 	if (ret < 0)
 		return ret;
 
 	p_div = _hw_to_p_div(hw, cfg.p);
-	if (p_div < 0)
-		return p_div;
+	if (p_div < 0) {
+		*rate = p_div;
+		return 0;
+	}
 
 	output_rate *= cfg.n;
 	do_div(output_rate, cfg.m * p_div);
 
-	return output_rate;
+	*rate = output_rate;
+	return 0;
 }
 
 static int clk_pllm_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -1273,12 +1281,13 @@  static unsigned long clk_pllre_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long clk_pllre_round_rate(struct clk_hw *hw, unsigned long rate,
+static int clk_pllre_round_rate(struct clk_hw *hw, unsigned long *rate,
 				 unsigned long *prate)
 {
 	struct tegra_clk_pll *pll = to_clk_pll(hw);
 
-	return _pllre_calc_rate(pll, NULL, rate, *prate);
+	*rate = _pllre_calc_rate(pll, NULL, *rate, *prate);
+	return 0;
 }
 
 static int clk_plle_tegra114_enable(struct clk_hw *hw)
diff --git a/drivers/clk/ti/clk-dra7-atl.c b/drivers/clk/ti/clk-dra7-atl.c
index d86bc46..3264cc3 100644
--- a/drivers/clk/ti/clk-dra7-atl.c
+++ b/drivers/clk/ti/clk-dra7-atl.c
@@ -124,16 +124,17 @@  static unsigned long atl_clk_recalc_rate(struct clk_hw *hw,
 	return parent_rate / cdesc->divider;
 }
 
-static long atl_clk_round_rate(struct clk_hw *hw, unsigned long rate,
-			       unsigned long *parent_rate)
+static int atl_clk_round_rate(struct clk_hw *hw, unsigned long *rate,
+			      unsigned long *parent_rate)
 {
 	unsigned divider;
 
-	divider = (*parent_rate + rate / 2) / rate;
+	divider = (*parent_rate + *rate / 2) / *rate;
 	if (divider > DRA7_ATL_DIVIDER_MASK + 1)
 		divider = DRA7_ATL_DIVIDER_MASK + 1;
 
-	return *parent_rate / divider;
+	*rate = *parent_rate / divider;
+	return 0;
 }
 
 static int atl_clk_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/ti/composite.c b/drivers/clk/ti/composite.c
index 96f83ce..6900a45 100644
--- a/drivers/clk/ti/composite.c
+++ b/drivers/clk/ti/composite.c
@@ -36,8 +36,8 @@  static unsigned long ti_composite_recalc_rate(struct clk_hw *hw,
 	return ti_clk_divider_ops.recalc_rate(hw, parent_rate);
 }
 
-static long ti_composite_round_rate(struct clk_hw *hw, unsigned long rate,
-				    unsigned long *prate)
+static int ti_composite_round_rate(struct clk_hw *hw, unsigned long *rate,
+				   unsigned long *prate)
 {
 	return -EINVAL;
 }
diff --git a/drivers/clk/ti/divider.c b/drivers/clk/ti/divider.c
index ff5f117..6044251 100644
--- a/drivers/clk/ti/divider.c
+++ b/drivers/clk/ti/divider.c
@@ -200,13 +200,14 @@  static int ti_clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
 	return bestdiv;
 }
 
-static long ti_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
-				      unsigned long *prate)
+static int ti_clk_divider_round_rate(struct clk_hw *hw, unsigned long *rate,
+				     unsigned long *prate)
 {
 	int div;
-	div = ti_clk_divider_bestdiv(hw, rate, prate);
+	div = ti_clk_divider_bestdiv(hw, *rate, prate);
 
-	return DIV_ROUND_UP(*prate, div);
+	*rate = DIV_ROUND_UP(*prate, div);
+	return 0;
 }
 
 static int ti_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/ux500/clk-prcmu.c b/drivers/clk/ux500/clk-prcmu.c
index bf63c96..1e1aa2d 100644
--- a/drivers/clk/ux500/clk-prcmu.c
+++ b/drivers/clk/ux500/clk-prcmu.c
@@ -80,11 +80,18 @@  static unsigned long clk_prcmu_recalc_rate(struct clk_hw *hw,
 	return prcmu_clock_rate(clk->cg_sel);
 }
 
-static long clk_prcmu_round_rate(struct clk_hw *hw, unsigned long rate,
-				 unsigned long *parent_rate)
+static int clk_prcmu_round_rate(struct clk_hw *hw, unsigned long *rate,
+				unsigned long *parent_rate)
 {
 	struct clk_prcmu *clk = to_clk_prcmu(hw);
-	return prcmu_round_clock_rate(clk->cg_sel, rate);
+	long ret;
+
+	ret = prcmu_round_clock_rate(clk->cg_sel, *rate);
+	if (ret < 0)
+		return ret;
+
+	*rate = ret;
+	return 0;
 }
 
 static int clk_prcmu_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/versatile/clk-icst.c b/drivers/clk/versatile/clk-icst.c
index bc96f10..6404e61 100644
--- a/drivers/clk/versatile/clk-icst.c
+++ b/drivers/clk/versatile/clk-icst.c
@@ -91,14 +91,15 @@  static unsigned long icst_recalc_rate(struct clk_hw *hw,
 	return icst->rate;
 }
 
-static long icst_round_rate(struct clk_hw *hw, unsigned long rate,
-			    unsigned long *prate)
+static int icst_round_rate(struct clk_hw *hw, unsigned long *rate,
+			   unsigned long *prate)
 {
 	struct clk_icst *icst = to_icst(hw);
 	struct icst_vco vco;
 
-	vco = icst_hz_to_vco(icst->params, rate);
-	return icst_hz(icst->params, vco);
+	vco = icst_hz_to_vco(icst->params, *rate);
+	*rate = icst_hz(icst->params, vco);
+	return 0;
 }
 
 static int icst_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/versatile/clk-vexpress-osc.c b/drivers/clk/versatile/clk-vexpress-osc.c
index 89c0609..36d74b5 100644
--- a/drivers/clk/versatile/clk-vexpress-osc.c
+++ b/drivers/clk/versatile/clk-vexpress-osc.c
@@ -39,18 +39,18 @@  static unsigned long vexpress_osc_recalc_rate(struct clk_hw *hw,
 	return rate;
 }
 
-static long vexpress_osc_round_rate(struct clk_hw *hw, unsigned long rate,
+static int vexpress_osc_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *parent_rate)
 {
 	struct vexpress_osc *osc = to_vexpress_osc(hw);
 
-	if (WARN_ON(osc->rate_min && rate < osc->rate_min))
-		rate = osc->rate_min;
+	if (WARN_ON(osc->rate_min && *rate < osc->rate_min))
+		*rate = osc->rate_min;
 
-	if (WARN_ON(osc->rate_max && rate > osc->rate_max))
-		rate = osc->rate_max;
+	if (WARN_ON(osc->rate_max && *rate > osc->rate_max))
+		*rate = osc->rate_max;
 
-	return rate;
+	return 0;
 }
 
 static int vexpress_osc_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/clk/zynq/pll.c b/drivers/clk/zynq/pll.c
index 00d72fb..b62d298 100644
--- a/drivers/clk/zynq/pll.c
+++ b/drivers/clk/zynq/pll.c
@@ -60,18 +60,19 @@  struct zynq_pll {
  * @prate:	Clock frequency of parent clock
  * Returns frequency closest to @rate the hardware can generate.
  */
-static long zynq_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+static int zynq_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *prate)
 {
 	u32 fbdiv;
 
-	fbdiv = DIV_ROUND_CLOSEST(rate, *prate);
+	fbdiv = DIV_ROUND_CLOSEST(*rate, *prate);
 	if (fbdiv < PLL_FBDIV_MIN)
 		fbdiv = PLL_FBDIV_MIN;
 	else if (fbdiv > PLL_FBDIV_MAX)
 		fbdiv = PLL_FBDIV_MAX;
 
-	return *prate * fbdiv;
+	*rate = *prate * fbdiv;
+	return 0;
 }
 
 /**
diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 4216e47..0695428 100644
--- a/drivers/gpu/drm/imx/imx-tve.c
+++ b/drivers/gpu/drm/imx/imx-tve.c
@@ -423,17 +423,20 @@  static unsigned long clk_tve_di_recalc_rate(struct clk_hw *hw,
 	return 0;
 }
 
-static long clk_tve_di_round_rate(struct clk_hw *hw, unsigned long rate,
-				  unsigned long *prate)
+static int clk_tve_di_round_rate(struct clk_hw *hw, unsigned long *rate,
+				 unsigned long *prate)
 {
 	unsigned long div;
 
-	div = *prate / rate;
+	div = *prate / *rate;
 	if (div >= 4)
-		return *prate / 4;
+		*rate = *prate / 4;
 	else if (div >= 2)
-		return *prate / 2;
-	return *prate;
+		*rate = *prate / 2;
+	else
+		*rate = *prate;
+
+	return 0;
 }
 
 static int clk_tve_di_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8960.c b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8960.c
index eeed006..97cdcb4 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_phy_8960.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_phy_8960.c
@@ -336,11 +336,12 @@  static unsigned long hdmi_pll_recalc_rate(struct clk_hw *hw,
 	return phy_8960->pixclk;
 }
 
-static long hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+static int hdmi_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *parent_rate)
 {
-	const struct pll_rate *pll_rate = find_rate(rate);
-	return pll_rate->rate;
+	const struct pll_rate *pll_rate = find_rate(*rate);
+	*rate = pll_rate->rate;
+	return 0;
 }
 
 static int hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c
index ce42459..c89b109 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_pll.c
@@ -109,11 +109,12 @@  static unsigned long mpd4_lvds_pll_recalc_rate(struct clk_hw *hw,
 	return lvds_pll->pixclk;
 }
 
-static long mpd4_lvds_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+static int mpd4_lvds_pll_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *parent_rate)
 {
-	const struct pll_rate *pll_rate = find_rate(rate);
-	return pll_rate->rate;
+	const struct pll_rate *pll_rate = find_rate(*rate);
+	*rate = pll_rate->rate;
+	return 0;
 }
 
 static int mpd4_lvds_pll_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index deca809..4d5ba85 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -231,11 +231,11 @@  static u32 isp_xclk_calc_divider(unsigned long *rate, unsigned long parent_rate)
 	return divider;
 }
 
-static long isp_xclk_round_rate(struct clk_hw *hw, unsigned long rate,
+static int isp_xclk_round_rate(struct clk_hw *hw, unsigned long *rate,
 				unsigned long *parent_rate)
 {
-	isp_xclk_calc_divider(&rate, *parent_rate);
-	return rate;
+	isp_xclk_calc_divider(rate, *parent_rate);
+	return 0;
 }
 
 static int isp_xclk_set_rate(struct clk_hw *hw, unsigned long rate,
diff --git a/drivers/rtc/rtc-hym8563.c b/drivers/rtc/rtc-hym8563.c
index b936bb4..5e6f5a5 100644
--- a/drivers/rtc/rtc-hym8563.c
+++ b/drivers/rtc/rtc-hym8563.c
@@ -316,15 +316,19 @@  static unsigned long hym8563_clkout_recalc_rate(struct clk_hw *hw,
 	return clkout_rates[ret];
 }
 
-static long hym8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
-				      unsigned long *prate)
+static int hym8563_clkout_round_rate(struct clk_hw *hw, unsigned long *rate,
+				     unsigned long *prate)
 {
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
-		if (clkout_rates[i] <= rate)
-			return clkout_rates[i];
+	for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) {
+		if (clkout_rates[i] <= *rate) {
+			*rate = clkout_rates[i];
+			return 0;
+		}
+	}
 
+	*rate = 0;
 	return 0;
 }
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index df69531..84047b1 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -173,8 +173,8 @@  struct clk_ops {
 	void		(*disable_unused)(struct clk_hw *hw);
 	unsigned long	(*recalc_rate)(struct clk_hw *hw,
 					unsigned long parent_rate);
-	long		(*round_rate)(struct clk_hw *hw, unsigned long rate,
-					unsigned long *parent_rate);
+	int		(*round_rate)(struct clk_hw *hw, unsigned long *rate,
+				      unsigned long *parent_rate);
 	long		(*determine_rate)(struct clk_hw *hw,
 					  unsigned long rate,
 					  unsigned long min_rate,
@@ -365,7 +365,7 @@  extern const struct clk_ops clk_divider_ops;
 unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
 		unsigned int val, const struct clk_div_table *table,
 		unsigned long flags);
-long divider_round_rate(struct clk_hw *hw, unsigned long rate,
+int divider_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *prate, const struct clk_div_table *table,
 		u8 width, unsigned long flags);
 int divider_get_val(unsigned long rate, unsigned long parent_rate,
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index 6784400..3b2406c 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h
@@ -277,9 +277,9 @@  long omap3_noncore_dpll_determine_rate(struct clk_hw *hw,
 				       struct clk_hw **best_parent_clk);
 unsigned long omap4_dpll_regm4xen_recalc(struct clk_hw *hw,
 					 unsigned long parent_rate);
-long omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
-				    unsigned long target_rate,
-				    unsigned long *parent_rate);
+int omap4_dpll_regm4xen_round_rate(struct clk_hw *hw,
+				   unsigned long *target_rate,
+				   unsigned long *parent_rate);
 long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw,
 					unsigned long rate,
 					unsigned long min_rate,
@@ -288,14 +288,14 @@  long omap4_dpll_regm4xen_determine_rate(struct clk_hw *hw,
 					struct clk_hw **best_parent_clk);
 u8 omap2_init_dpll_parent(struct clk_hw *hw);
 unsigned long omap3_dpll_recalc(struct clk_hw *hw, unsigned long parent_rate);
-long omap2_dpll_round_rate(struct clk_hw *hw, unsigned long target_rate,
-			   unsigned long *parent_rate);
+int omap2_dpll_round_rate(struct clk_hw *hw, unsigned long *target_rate,
+			  unsigned long *parent_rate);
 void omap2_init_clk_clkdm(struct clk_hw *clk);
 unsigned long omap3_clkoutx2_recalc(struct clk_hw *hw,
 				    unsigned long parent_rate);
 int omap3_clkoutx2_set_rate(struct clk_hw *hw, unsigned long rate,
 					unsigned long parent_rate);
-long omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long rate,
+int omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long *rate,
 		unsigned long *prate);
 int omap2_clkops_enable_clkdm(struct clk_hw *hw);
 void omap2_clkops_disable_clkdm(struct clk_hw *hw);