[RFC PATCH 3/4] dt-bindings: panel: Introduce dual-link LVDS panel

[Krzysztof Kozlowski]

On 03/01/2023 12:02, Aradhya Bhatia wrote:
> But this is throwing an error. I am confused what else could be done.
> Can you please suggest what might be a more accurate check here?
> 
>>
>>> +              required:
>>> +                - dual-lvds-odd-pixels
>>> +        then:
>>> +          properties:
>>> +            port at 1:
>>> +              properties:
>>> +                dual-lvds-even-pixels: true
>>> +                dual-lvds-odd-pixels: false
>>
>> Why do you need this? Your oneOf before already solves it.
> 
> I agree with your comment here. It makes sense to only have
> 
> 	dual-lvds-even-pixels: true
> 
> and have the oneOf condition take care of the other. But, I just tested
> this and it was unable to pick-up this intentionally-added error.
> 
> I added 'dual-lvds-odd-pixels' property to both the nodes, and
> dt_binding_check passes successfully (which it should have not.)
> 
> Instead, if I only keep this,
> 
> 	dual-lvds-odd-pixels: false
> 
> then the dt_binding_check detects the error as it should.
> 
> Regardless, I am curious why the first method doesn't work. Will try to
> explore more on that.

The check for presence of properties is only against required:, but you
added there properties. Like this:

https://elixir.bootlin.com/linux/v5.17-rc2/source/Documentation/devicetree/bindings/mfd/samsung,s5m8767.yaml#L155


Other way is to drop your both oneOf and entire allOf from ports and use:

oneOf:
  - properties:
      ports:
        $ref: /schemas/graph.yaml#/properties/ports
        properties:
          port at 0:
            required:
              - dual-lvds-odd-pixels
          port at 1:
            required:
              - dual-lvds-even-pixels
  - properties:
      ports:
        $ref: /schemas/graph.yaml#/properties/ports
        properties:
          port at 1:
            required:
              - dual-lvds-odd-pixels
          port at 0:
            required:
              - dual-lvds-even-pixels


Best regards,
Krzysztof