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[v4,0/5] Add the cat24c208 EDID EEPROM driver + new EDID capability

Message ID 20221111132906.2212662-1-hljunggr@cisco.com (mailing list archive)
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Erling Ljunggren Nov. 11, 2022, 1:29 p.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 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.

v4:
 - update driver and bindings to support a video input connector phandle
 - use connector phandle to get HPD gpio and input label

v3:
 - use old V4L2_CAP_ASYNCIO (0x02000000) capability bit
 - validate physical address of edid in driver
 - handle empty edid in driver
 - add cec notifier support to driver
 - update driver and bindings with hpd gpio support
 - removed references to "memory" in capability and docs
 - associate ioctls based on device direction

v2:
 - fix dt binding example
 - rename i2c client variables in data struct
 - fix include: of_device.h -> mod_devicetable.h
 - sorted makefile
 - used define EDID_OFFSET_EXT_FLAG instead of magic number
 - removed of_match_ptr
 - added bus_info
 - remove unneeded headers
 - add depends on OF to Kconfig

Erling Ljunggren (4):
  media: videodev2.h: add V4L2_CAP_EDID
  media: docs: Add V4L2_CAP_EDID
  dt-bindings: media: add cat24c208 bindings
  media: v4l2-dev: handle V4L2_CAP_EDID

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

 .../bindings/media/i2c/onnn,cat24c208.yaml    |  46 ++
 .../userspace-api/media/v4l/biblio.rst        |  11 +
 .../media/v4l/vidioc-querycap.rst             |  11 +
 .../media/videodev2.h.rst.exceptions          |   1 +
 MAINTAINERS                                   |   7 +
 drivers/media/i2c/Kconfig                     |   9 +
 drivers/media/i2c/Makefile                    |   1 +
 drivers/media/i2c/cat24c208.c                 | 499 ++++++++++++++++++
 drivers/media/v4l2-core/v4l2-dev.c            |  15 +
 include/uapi/linux/videodev2.h                |   1 +
 10 files changed, 601 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/onnn,cat24c208.yaml
 create mode 100644 drivers/media/i2c/cat24c208.c