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Some targets control the ADV7180 power pin via a gpio, so add optional support for "powerdown" pin control. Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> Tested-by: Tim Harvey <tharvey@gateworks.com> Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>