This patch extends LED Flash class documention by
the description of interactions with v4l2-flash sub-device.
Signed-off-by: NJacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: NKyungmin Park <kyungmin.park@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NBryan Wu <cooloney@gmail.com>