media: atomisp: csi2-bridge: Add support for setting "clock-" and "link-frequencies" props

Some standard v4l2 sensor drivers from drivers/media/i2c expect a
"clock-frequency" property on the device indicating the frequency
of the extclk for the sensor. Example of such drivers are the
ov2680 and ov5693 drivers.

The standard ov5693 sensor also expects a "link-frequencies" property.
Add support for setting both properties.

Note the "clock-frequency" prop is added before the "rotation" prop while
the "link-frequencies" are added at the end to match the ipu3 cio2-bridge
code from which this is derived.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/staging/media/atomisp/pci/atomisp_csi2.h    | 13 +++++++++----
 .../staging/media/atomisp/pci/atomisp_csi2_bridge.c | 12 ++++++++++--
 2 files changed, 19 insertions(+), 6 deletions(-)
  

On Tue, Jun 6, 2023 at 4:31 PM Hans de Goede <hdegoede@redhat.com> wrote:
>
> Some standard v4l2 sensor drivers from drivers/media/i2c expect a
> "clock-frequency" property on the device indicating the frequency
> of the extclk for the sensor. Example of such drivers are the
> ov2680 and ov5693 drivers.
>
> The standard ov5693 sensor also expects a "link-frequencies" property.
> Add support for setting both properties.
>
> Note the "clock-frequency" prop is added before the "rotation" prop while
> the "link-frequencies" are added at the end to match the ipu3 cio2-bridge
> code from which this is derived.

LGTM,
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  drivers/staging/media/atomisp/pci/atomisp_csi2.h    | 13 +++++++++----
>  .../staging/media/atomisp/pci/atomisp_csi2_bridge.c | 12 ++++++++++--
>  2 files changed, 19 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_csi2.h b/drivers/staging/media/atomisp/pci/atomisp_csi2.h
> index b389ccda5e98..16ddb3ab2963 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_csi2.h
> +++ b/drivers/staging/media/atomisp/pci/atomisp_csi2.h
> @@ -31,6 +31,7 @@
>  #define CSI2_PADS_NUM          2
>
>  #define CSI2_MAX_LANES         4
> +#define CSI2_MAX_LINK_FREQS    3
>
>  #define CSI2_MAX_ACPI_GPIOS    2u
>
> @@ -64,10 +65,12 @@ enum atomisp_csi2_sensor_swnodes {
>  };
>
>  struct atomisp_csi2_property_names {
> +       char clock_frequency[16];
>         char rotation[9];
>         char bus_type[9];
>         char data_lanes[11];
>         char remote_endpoint[16];
> +       char link_frequencies[17];
>  };
>
>  struct atomisp_csi2_node_names {
> @@ -79,6 +82,8 @@ struct atomisp_csi2_node_names {
>  struct atomisp_csi2_sensor_config {
>         const char *hid;
>         int lanes;
> +       int nr_link_freqs;
> +       u64 link_freqs[CSI2_MAX_LINK_FREQS];
>  };
>
>  struct atomisp_csi2_sensor {
> @@ -93,10 +98,10 @@ struct atomisp_csi2_sensor {
>         struct software_node swnodes[SWNODE_COUNT];
>         struct atomisp_csi2_node_names node_names;
>         struct atomisp_csi2_property_names prop_names;
> -       /* "rotation" + terminating entry */
> -       struct property_entry dev_properties[2];
> -       /* "bus-type", "data-lanes", "remote-endpoint" + terminating entry */
> -       struct property_entry ep_properties[4];
> +       /* "clock-frequency", "rotation" + terminating entry */
> +       struct property_entry dev_properties[3];
> +       /* "bus-type", "data-lanes", "remote-endpoint" + "link-freq" + terminating entry */
> +       struct property_entry ep_properties[5];
>         /* "data-lanes", "remote-endpoint" + terminating entry */
>         struct property_entry csi2_properties[3];
>         struct software_node_ref_args local_ref[1];
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
> index 28d8779bbbc4..0d12ba78d9c1 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
> +++ b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
> @@ -85,7 +85,7 @@ static const guid_t atomisp_dsm_guid =
>
>  /*
>   * Extend this array with ACPI Hardware IDs of sensors known to be working
> - * plus the number of links expected by their drivers.
> + * plus the default number of links + link-frequencies.
>   *
>   * Do not add an entry for a sensor that is not actually supported,
>   * or which have not yet been converted to work without atomisp_gmin
> @@ -492,10 +492,12 @@ static int atomisp_csi2_add_gpio_mappings(struct atomisp_csi2_sensor *sensor,
>  }
>
>  static const struct atomisp_csi2_property_names prop_names = {
> +       .clock_frequency = "clock-frequency",
>         .rotation = "rotation",
>         .bus_type = "bus-type",
>         .data_lanes = "data-lanes",
>         .remote_endpoint = "remote-endpoint",
> +       .link_frequencies = "link-frequencies",
>  };
>
>  static void atomisp_csi2_create_fwnode_properties(struct atomisp_csi2_sensor *sensor,
> @@ -507,7 +509,9 @@ static void atomisp_csi2_create_fwnode_properties(struct atomisp_csi2_sensor *se
>         sensor->local_ref[0] = SOFTWARE_NODE_REFERENCE(&sensor->swnodes[SWNODE_CSI2_ENDPOINT]);
>         sensor->remote_ref[0] = SOFTWARE_NODE_REFERENCE(&sensor->swnodes[SWNODE_SENSOR_ENDPOINT]);
>
> -       sensor->dev_properties[0] = PROPERTY_ENTRY_U32(sensor->prop_names.rotation, 0);
> +       sensor->dev_properties[0] = PROPERTY_ENTRY_U32(sensor->prop_names.clock_frequency,
> +                                                      PMC_CLK_RATE_19_2MHZ);
> +       sensor->dev_properties[1] = PROPERTY_ENTRY_U32(sensor->prop_names.rotation, 0);
>
>         sensor->ep_properties[0] = PROPERTY_ENTRY_U32(sensor->prop_names.bus_type,
>                                                       V4L2_FWNODE_BUS_TYPE_CSI2_DPHY);
> @@ -516,6 +520,10 @@ static void atomisp_csi2_create_fwnode_properties(struct atomisp_csi2_sensor *se
>                                                                 sensor->lanes);
>         sensor->ep_properties[2] = PROPERTY_ENTRY_REF_ARRAY(sensor->prop_names.remote_endpoint,
>                                                             sensor->local_ref);
> +       if (cfg->nr_link_freqs > 0)
> +               sensor->ep_properties[3] =
> +                       PROPERTY_ENTRY_U64_ARRAY_LEN(sensor->prop_names.link_frequencies,
> +                                                    cfg->link_freqs, cfg->nr_link_freqs);
>
>         sensor->csi2_properties[0] = PROPERTY_ENTRY_U32_ARRAY_LEN(sensor->prop_names.data_lanes,
>                                                                   bridge->data_lanes,
> --
> 2.40.1
>