media: ov5640: Add light frequency control
Add the light frequency control to be able to set the frequency to manual (50Hz or 60Hz) or auto. [Sakari Ailus: Rename "ctl" as "ctrl" as agreed.] [mchehab+samsung@kernel.org: fixed two coding style warnings] Signed-off-by: Mylène Josserand <mylene.josserand@bootlin.com> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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