docs: media: vimc: document RGB/YUV input entity
Update the vimc admin guide to describe the RGB/YUV input entity and
show how to use it in a pipeline.
The existing media-ctl and v4l2-ctl examples are updated to:
Use the correct device name, platform:vimc.0.
Keep the original sensor → debayer → scaler pipeline example.
Add a new example that switches the scaler input to the RGB/YUV
entity and requests ARGB output with a padded capture stride via
bytesperline.
A new vimc-input subdevice section documents the RGB/YUV frame source
entity, its default RGB888 bus format, and how it can be used for
software-driven frame injection in pipelines that start after a real
debayer stage.
This makes it easier for users to understand and exercise the RGB/YUV
input entity in vimc-based experiments.
Link: https://lore.kernel.org/r/20251120084926.18620-6-opensource206@gmail.com
Signed-off-by: Pavan Bobba <opensource206@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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