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Document the bindings for the cec-gpio module for hardware where the CEC line and optionally the HPD line are connected to GPIO lines. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>