[PATCH 1/2] Documentation: v4l: Flip handling for RAW sensors

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Document the requirement of notifying to userspace the possible
re-ordering of the color sample components when a vertical or horizontal
flip is applied to a RAW camera sensor.

Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
---
 Documentation/driver-api/media/camera-sensor.rst | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/driver-api/media/camera-sensor.rst b/Documentation/driver-api/media/camera-sensor.rst
index 93f4f2536c25..ee4a7fe5f72a 100644
--- a/Documentation/driver-api/media/camera-sensor.rst
+++ b/Documentation/driver-api/media/camera-sensor.rst
@@ -173,3 +173,19 @@ V4L2_CID_VFLIP controls with the values programmed by the register sequences.
 The default values of these controls shall be 0 (disabled). Especially these
 controls shall not be inverted, independently of the sensor's mounting
 rotation.
+
+Flip handling for raw camera sensors
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Applying vertical and horizontal flips on raw camera sensors inverts the color
+sample reading direction on the sensor's pixel array. This causes the
+re-ordering of the color samples on the sensor's output frame. As an example, a
+raw camera sensor with a Bayer pattern color filter array and a native RGGB
+Bayer order will produce frames with GRBG component ordering when a vertical
+flip is applied. Camera sensor drivers where inverting the reading order
+direction causes a re-ordering of the color components are requested to register
+the ``V4L2_CID_VFLIP`` and ``V4L2_CID_HFLIP`` controls with the
+``V4L2_CTRL_FLAG_MODIFY_LAYOUT`` flag enabled to notify userspace that enabling
+a flip can potentially change the output buffer content layout. Flips should
+also be taken into account when enumerating and handling media bus formats
+on the camera sensor source pads.
-- 
2.40.1




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