[PATCH v3 0/8] v4l2-subdev: Introduce [g|s]et_mbus_format pad op

[Jacopo Mondi <jacopo+renesas@jmondi.org>]

Hello,
   in this v3 I have re-used as much as possible the existing infrastructure
by using the v4l2-mediabus.h defined V4L2_MBUS_* flags and using the existing
struct v4l2_mbus_config as argument of the new operations.

I've done so in order to first port all existing users to the new operation,
which is now done in this version.

Most of the existing users are i2c camera drivers reporting a static media bus
configuration though g_mbus_config. Porting them is performed in a single
hopefully not controversial patch [2/8]

Two existing users stand-out, and they've probably been developed together:
pxa_camera and ov6650. Those have bee ported separately in single patches
with extensive change logs as their operations semantic had to change to port
them to use the new operations. Not having any of those two platforms, the
changes have been compile-tested only.

The only existing users of the s|g_mbus_config ops are now the soc_camera based
drivers currently living in staging.

The last three patches are similar to the ones posted in v2, with the exception
that they have been updated to use the V4L2_MBUS_* flags as well.

Will report again the use cases I'm trying to address here:
------------------------------------------------------------------------------
Quoting:
https://patchwork.kernel.org/cover/10855919/
"The use case this series cover is the following one:
the Gen-3 R-Car boards include an ADV748x HDMI/CVBS to CSI-2 converter
connected to its CSI-2 receivers. The ADV748x chip has recently gained support
for routing both HDMI and analogue video streams through its 4 lanes TXA
transmitter, specifically to support the Ebisu board that has a single CSI-2
receiver, compared to all other Gen-3 board where the ADV748x TXes are connected
to different CSI-2 receivers, and where analogue video is streamed out from the
ADV748x single lane TXB transmitter.
To properly support transmission of analogue video through TXA, the number of
data lanes shall be dynamically reduced to 1, in order to comply with the MIPI
CSI-2 minimum clock frequency requirements"

During the discussion of the RFC, Dave reported another use case for media
bus parameter negotiation on his platform:
https://patchwork.kernel.org/patch/10855923/#22569149

Hyun is now using this series to configure GMSL devices.
------------------------------------------------------------------------------

Thanks
   j

v2->v3:
- Re-use v4l2_mbus_config and V4L2_MBUS_* flags
- Port existing drivers
- Update adv748x and rcar-csi2 patches to use V4L2_MBUS_* flags

v1->v2:
- Address Sakari's comment to use unsigned int in place of bools
- Add two new patches to address documentation
- Adjust rcar-csi2 patch as much as possible according to Niklas comments
- Add Niklas's tags

Jacopo Mondi (8):
  media: v4l2-subdv: Introduce [s|g]et_mbus_config pad ops
  media: i2c: Use the new get_mbus_config pad op
  media: i2c: ov6650: Use new [g|s]_mbus_config op
  media: pxa_camera: Use the new set_mbus_config op
  media: v4l2-subdev: Deprecate g_mbus_config video op
  media: i2c: adv748x: Adjust TXA data lanes number
  media: i2c: adv748x: Implement get_mbus_config
  media: rcar-csi2: Negotiate data lanes number

 drivers/media/i2c/adv7180.c                 |   7 +-
 drivers/media/i2c/adv748x/adv748x-core.c    |  31 +++-
 drivers/media/i2c/adv748x/adv748x-csi2.c    |  31 ++++
 drivers/media/i2c/adv748x/adv748x.h         |   1 +
 drivers/media/i2c/ml86v7667.c               |   7 +-
 drivers/media/i2c/mt9m001.c                 |   7 +-
 drivers/media/i2c/mt9m111.c                 |   7 +-
 drivers/media/i2c/ov6650.c                  |  56 ++++--
 drivers/media/i2c/ov9640.c                  |   7 +-
 drivers/media/i2c/tc358743.c                |   7 +-
 drivers/media/i2c/tvp5150.c                 |   7 +-
 drivers/media/platform/pxa_camera.c         | 184 +++++---------------
 drivers/media/platform/rcar-vin/rcar-csi2.c |  61 ++++++-
 include/media/v4l2-subdev.h                 |  34 +++-
 14 files changed, 259 insertions(+), 188 deletions(-)

--
2.26.2