drm/vc4: add HDMI CEC support
This patch adds support to VC4 for CEC. It is under a separate Kconfig option to keep everyone using VC4 from needing to pull in the CEC core. Thanks to Eric Anholt for providing me with the CEC register information. Signed-off-by:Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:
Eric Anholt <eric@anholt.net> Reviewed-by:
Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20170716104804.48308-4-hverkuil@xs4all.nl
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