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Subject[PATCH v3 0/7] media: imx274: cleanups, improvements and SELECTION API support

this patchset introduces cropping support for the Sony IMX274 sensor
using the SELECTION API.

v3 has a few minor improvements over v2. It also removes the first 6
patches, already applied on the media_tree master branch.

After v2 there has been a short discussion with Sakari Ailus on how
cropping should be configured from userspace [0]. That discussion has
gone stale before I could understand the idea behind the changes
suggested by Sakari, so I'm sending the most up-to-date version of the
old implementation to give it a new spin. I'll be glad to rework my
patch when things are clearer.

Patches 1-5 are overall improvements and restructuring, mostly useful
to implement the SELECTION API in a clean way.

Patch 6 introduces a helper to allow setting many registers computed
at runtime in a straightforward way. This would not have been very
useful before because all long register write sequences came from
const tables, but it's definitely a must for the cropping code where
several register values are computed at runtime.

Patch 7 implements cropping in the set_selection pad operation. On the
v4l2 side there is nothing special. The most tricky part was
respecting all the device constraints on the horizontal crop.

Usage examples:

* Capture the entire 4K area, downscaled to 1080p with 2:1 binning:
media-ctl -V '"IMX274":0[crop:(0,0)/3840x2160]'
media-ctl -V '"IMX274":0[fmt:SRGGB8_1X8/1920x1080 field:none]'

* Capture the central 1080p area (no binning):
media-ctl -V '"IMX274":0[crop:(960,540)/1920x1080]'
(this also sets the fmt to 1920x1080)



Luca Ceresoli (7):
media: imx274: initialize format before v4l2 controls
media: imx274: consolidate per-mode data in imx274_frmfmt
media: imx274: get rid of mode_index
media: imx274: actually use IMX274_DEFAULT_MODE
media: imx274: simplify imx274_write_table()
media: imx274: add helper function to fill a reg_8 table chunk
media: imx274: add SELECTION support for cropping

drivers/media/i2c/imx274.c | 552 +++++++++++++++++++++++++++------------------
1 file changed, 332 insertions(+), 220 deletions(-)


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