media: ov7670: Add the get_fmt callback
Add the get_fmt callback, also enable V4L2_SUBDEV_FL_HAS_DEVNODE flag to make this subdev has device node. Signed-off-by: NWenyou Yang <wenyou.yang@microchip.com> Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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