On 09/06/17 16:07, Rob Herring wrote:
> On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>>
>> 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@xxxxxxxxx>
>> Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
>> Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
>> Cc: devicetree@xxxxxxxxxxxxxxx
>> ---
>> Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
>> index 4bb08d9d940b..261af4d1a791 100644
>> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
>> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
>> @@ -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.
>
> Seems like something common. Can you document in a common location?
Should we do the same with hdmi-phandle? It is also used by CEC drivers to find
the HDMI driver.
Currently only used by s5p-cec and stih-cec, but there will be more.
I guess this would be a sensible place to document this:
Documentation/devicetree/bindings/media/cec.txt
Regards,
Hans
>
>> +
>> Example:
>>
>> hdmicec: cec@100B0000 {
>> --
>> 2.11.0
>>
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