linux-kernel - Re: [PATCH] dt-bindings: display: panel: add common definition of ports

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Message-ID: <20230420160905.GA2952736-robh@kernel.org>
Date:   Thu, 20 Apr 2023 11:09:05 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH] dt-bindings: display: panel: add common definition of
 ports

On Wed, Apr 19, 2023 at 10:56:55AM +0200, Krzysztof Kozlowski wrote:
> On 19/04/2023 00:26, Rob Herring wrote:
> > On Sun, Apr 16, 2023 at 05:39:29PM +0200, Krzysztof Kozlowski wrote:
> >> Few panel bindings for dual-link connections just type "ports: true",
> >> which does not enforce any type.  Add common definition of ports, so the
> >> type will be fixed.
> >>
> >> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >>
> >> ---
> >>
> >> Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
> >> ---
> >>  .../bindings/display/panel/panel-common.yaml     | 16 ++++++++++++++++
> >>  1 file changed, 16 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/display/panel/panel-common.yaml b/Documentation/devicetree/bindings/display/panel/panel-common.yaml
> >> index 5b38dc89cb21..ad62d34e6fa3 100644
> >> --- a/Documentation/devicetree/bindings/display/panel/panel-common.yaml
> >> +++ b/Documentation/devicetree/bindings/display/panel/panel-common.yaml
> >> @@ -70,6 +70,16 @@ properties:
> >>    port:
> >>      $ref: /schemas/graph.yaml#/properties/port
> >>  
> >> +  # For dual-link connections
> >> +  ports:
> >> +    $ref: /schemas/graph.yaml#/properties/ports
> >> +    patternProperties:
> >> +      "^port@[0-9a-f]+$":
> >> +        $ref: /schemas/graph.yaml#/$defs/port-base
> > 
> > This allows any undocumented property.
> 
> Yes, which I hope the device schema (using this panel-common) will
> narrow with additionalProperties: false.
> 
> I can make it explicit: additionalProperties: true.
> 
> Otherwise, how do I allow custom properties like:
> Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.yaml
> 
> > 
> >> +
> >> +    required:
> >> +      - port@0
> >> +
> > 
> > I don't think this should be added here because users must define what 
> > each port is. With it here, we're going to validate the nodes twice as 
> > well. Same can be said for 'port' though. It can't be extended though.
> 
> So you propose to drop entire "ports" here and expect every panel schema
> to define it instead?

Only those with more than 1 port or extra port/endpoint properties. If 
neither of those are true, then they can use just 'port'. Otherwise, 
all those panel bindings already have to define the port nodes already.

Rob