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Add a media_pipeline_for_each_entity() macro to iterate over entities in a pipeline. This should be used by driver as a replacement of the media_graph_walk API, as iterating over the media_pipeline uses the cached list of pads and is thus more efficient. Deprecate the media_graph_walk API to indicate it shouldn't be used in new drivers. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>