mbox series

[0/5] Add the cat24c208 EDID EEPROM driver + new EDID capability

Message ID 20220728114050.2400475-1-hljunggr@cisco.com (mailing list archive)
Headers
Series Add the cat24c208 EDID EEPROM driver + new EDID capability |

Message

Erling Ljunggren July 28, 2022, 11:40 a.m. UTC 
  This series adds support for the standalone cat24c208 EDID EEPROM i2c device.
Usually EDID support is part of an HDMI receiver, but this is a standalone EEPROM.

Note that EEPROMs for EDIDs are not regular EEPROM devices, these are dual port
devices that follow the VESA E-DDC standard.

Since this is a standalone device that does not capture any video a new
V4L2_CAP_EDID_MEMORY capability is introduced to represent such devices.
Note that such a device doesn't have to be an EEPROM, it can also be
implemented using a microcontroller, for example. Hence the use of the generic
word 'MEMORY'.

The new capability uses the free bit 0x00000008. But we are running out of
capability bits: only 0x40000000 and 0x00000008 are free at the moment.

There is one other capability V4L2_CAP_ASYNCIO (0x02000000) that is not used
at all, it was never implemented. Wouldn't it be better to define
V4L2_CAP_ASYNCIO to 0, mark it as obsolete, and instead reuse it for this
V4L2_CAP_EDID_MEMORY capability?

Erling Ljunggren (4):
  media: videodev2.h: add V4L2_CAP_EDID_MEMORY
  media: docs: Add V4L2_CAP_EDID_MEMORY
  dt-bindings: media: add cat24c208 bindings
  media: v4l2-dev: handle V4L2_CAP_EDID_MEMORY

Jonathan Selnes (1):
  media: i2c: cat24c208: driver for the cat24c208 EDID EEPROM

 .../bindings/media/i2c/onnn,cat24c208.yaml    |  40 ++
 .../userspace-api/media/v4l/biblio.rst        |  11 +
 .../media/v4l/vidioc-querycap.rst             |   7 +
 .../media/videodev2.h.rst.exceptions          |   1 +
 MAINTAINERS                                   |   7 +
 drivers/media/i2c/Kconfig                     |   9 +
 drivers/media/i2c/Makefile                    |   1 +
 drivers/media/i2c/cat24c208.c                 | 421 ++++++++++++++++++
 drivers/media/v4l2-core/v4l2-dev.c            |   8 +
 include/uapi/linux/videodev2.h                |   1 +
 10 files changed, 506 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/onnn,cat24c208.yaml
 create mode 100644 drivers/media/i2c/cat24c208.c