[media] media: vb2: Clarify queue_setup() and buf_prepare() usage documentation
Explain how the two operations must handle formats and validate buffer sizes when used with VIDIOC_CREATE_BUFS. Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>
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