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[media] dt-bindings: media/s5p-cec.txt: document needs-hpd property

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Needed for boards that wire the CEC pin in such a way that it
is unavailable when the HPD is low.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2017-06-07 11:46:14 -03:00 committed by Mauro Carvalho Chehab
parent 41c01d6582
commit e8537b35bf
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/media/s5p-cec.txt
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@ -17,6 +17,12 @@ Required properties:
- samsung,syscon-phandle - phandle to the PMU system controller
- hdmi-phandle - phandle to the HDMI controller
Optional:
- needs-hpd : if present the CEC support is only available when the HPD
is high. Some boards only let the CEC pin through if the HPD is high, for
example if there is a level converter that uses the HPD to power up
or down.
Example:
hdmicec: cec@100B0000 {