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On reference boards and derivatives, the HDMI Logic is powered by an external 5V regulator. This regulator was set by the Vendor U-Boot, add optional support for it. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Jerome Brunet <jbrunet@baylibre.com> Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> Link: https://patchwork.freedesktop.org/patch/msgid/1512561268-29806-4-git-send-email-narmstrong@baylibre.com