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It is often useful to figure out if a pixel_format is either YUV or RGB especially for driver who can perform the pixel encoding conversion. Instead of having each driver implement its own "is_this_yuv/rgb" function based on a restricted set of pixel value, it is better to do this in centralized manner. We therefore add a pixel_enc member to the v4l2_format_info structure to quickly identify the related pixel encoding. And add helper functions to check pixel encoding. Signed-off-by: Benoit Parrot <bparrot@ti.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>