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

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Date:   Tue, 3 Jan 2023 12:28:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Aradhya Bhatia <a-bhatia1@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Tomi Valkeinen <tomba@...nel.org>,
        Jyri Sarha <jyri.sarha@....fi>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Guo Ren <guoren@...nel.org>
Cc:     DRI Development List <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
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        Linux C-SKY Arch List <linux-csky@...r.kernel.org>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rahul T R <r-ravikumar@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jai Luthra <j-luthra@...com>,
        Jayesh Choudhary <j-choudhary@...com>
Subject: Re: [RFC PATCH 3/4] dt-bindings: panel: Introduce dual-link LVDS
 panel

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