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Date:   Tue, 3 Jan 2023 12:28:11 +0100
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Subject: Re: [RFC PATCH 3/4] dt-bindings: panel: Introduce dual-link LVDS
 panel
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To:     Aradhya Bhatia <a-bhatia1@ti.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Tomi Valkeinen <tomba@kernel.org>,
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        Sam Ravnborg <sam@ravnborg.org>,
        Maxime Ripard <maxime@cerno.tech>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
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From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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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@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@0:
            required:
              - dual-lvds-odd-pixels
          port@1:
            required:
              - dual-lvds-even-pixels
  - properties:
      ports:
        $ref: /schemas/graph.yaml#/properties/ports
        properties:
          port@1:
            required:
              - dual-lvds-odd-pixels
          port@0:
            required:
              - dual-lvds-even-pixels


Best regards,
Krzysztof