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Some dumb VGA DACs are active components which require external power.
Add support for specifying a regulator as its power supply.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20161116154232.872-2-wens@csie.org
(cherry picked from commit af948a25ec)
Change-Id: I711e3b444f72e04ee09e8ca4bfa8c04c3640039b
Signed-off-by: Jerry Xu <xbl@rock-chips.com>