[PATCH 1/2] dt-bindings: display: bridge: tc358867: Document default DP preemphasis

[Marek Vasut]

On 6/5/24 6:05 PM, Rob Herring wrote:

>>> diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
>>> index 2ad0cd6dd49e0..dcf56e996ee22 100644
>>> --- a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
>>> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
>>> @@ -98,6 +98,24 @@ properties:
>>>               reference to a valid eDP panel input endpoint node. This port is
>>>               optional, treated as DP panel if not defined
>>>   
>>> +        properties:
>>> +          endpoint:
>>> +            $ref: /schemas/media/video-interfaces.yaml#
>>> +            unevaluatedProperties: false
>>> +
>>> +            properties:
>>> +              toshiba,pre-emphasis:
>>> +                description:
>>> +                  Display port output Pre-Emphasis settings for both ports.
>>
>> Is this a property of the port or the endpoint?
> 
> What's the difference? Either is the same data path.
> 
> The preference is custom properties in endpoint node, not port nodes.

Let's keep it in the endpoint node.

There is some mention in the TC9595 datasheet that the DP might operate 
in some split mode, where each DP lane is used to feed one display (?), 
so I assume in that case there might be two endpoints (?), but that is 
not supported right now.

If that is ever needed, I guess this array would have minItems 1 and 
maxItems 2 and another endpoint would be added to the schema for this 
port 2.