[PATCH v2 2/3] Documentation: media: Describe V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado <ribalda@kernel.org>]

New control to pass to userspace the width/height of a pixel. Which is
needed for calibration and lens selection.

Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
---
 Documentation/media/uapi/v4l/ext-ctrls-camera.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
index 51c1d5c9eb00..b43047d4e7a1 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
@@ -510,6 +510,14 @@ enum v4l2_scene_mode -
     value down. A value of zero stops the motion if one is in progress
     and has no effect otherwise.
 
+``V4L2_CID_UNIT_CELL_SIZE (struct)``
+    This control returns the unit cell size in nanometres. The struct provides
+    the width and the height in separated fields to take into consideration
+    asymmetric pixels and/or hardware binning.
+    The unit cell consist on the whole area of the pixel, sensitive and
+    non-sensitive.
+    This control is required for automatic calibration sensors/cameras.
+
 .. [#f1]
    This control may be changed to a menu control in the future, if more
    options are required.
-- 
2.23.0.rc1