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media: imx: imx7_media-csi: Create immutable link to source device
The CSI subdev has a single source, the input video mux. There's thus a
single link between the source and the CSI, which can be made immutable
and enabled to simplify configuration.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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