[libcamera-devel] (no subject)

[Jacopo Mondi]

Subject: [PATCH 0/4] media: docs: Document pixel array properties

Hans' patch "[PATCH] imx219: selection compliance fixes" sparkled a discussion
on how the V4L2 selection targets have to be used in order to access an
image sensor pixel array properties.

The discussion shown how much under-specified that part was, so this is
an attempt to provide a bit documentation for this.

My feeling is that we're hijacking the existing targets for this use case
and we should probably define new ones, considering how few users we have in
mainline of them at the moment.

On top Hans' patch with reworded commit message and minor updates.

For reference, we're using the V4L2 selection targets in libcamera to retrieve
the sensor pixel array properties to be reported to applications for
calibration purposes. The currently defined pixel properties for libcamera
are available here:
https://git.linuxtv.org/libcamera.git/tree/src/libcamera/property_ids.yaml#n390

Thanks
   j

Hans Verkuil (1):
  media: i2c: imx219: Selection compliance fixes

Jacopo Mondi (3):
  media: docs: Describe pixel array properties
  media: docs: Describe targets for sensor properties
  media: docs: USe SUBDEV_G_SELECTION for sensor properties

 .../userspace-api/media/v4l/dev-subdev.rst    | 85 +++++++++++++++++++
 .../media/v4l/v4l2-selection-targets.rst      | 49 +++++++++++
 .../media/v4l/vidioc-subdev-g-selection.rst   |  4 +
 drivers/media/i2c/imx219.c                    | 17 ++--
 4 files changed, 147 insertions(+), 8 deletions(-)

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2.27.0