media: subdev: add v4l2_subdev_routing_validate() helper
Add a v4l2_subdev_routing_validate() helper for verifying routing for common cases like only allowing non-overlapping 1-to-1 streams. Signed-off-by:Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by:
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Reviewed-by:
Jacopo Mondi <jacopo@jmondi.org> Signed-off-by:
Mauro Carvalho Chehab <mchehab@kernel.org>
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