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Document a new kAPI function to register subdev device nodes in read only mode and for each affected ioctl report how access is restricted. Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>