linux-kernel - Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: do not reference whole usb-switch.yaml

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Message-ID: <6d5009cf-9332-4c0f-acf3-baa6a0be3f0d@linaro.org>
Date: Wed, 17 Sep 2025 09:00:36 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Rob Herring <robh@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Krzysztof Kozlowski <krzk@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: do not
 reference whole usb-switch.yaml

Hi,

On 08/09/2025 09:33, Neil Armstrong wrote:
> On 05/09/2025 19:55, Rob Herring wrote:
>> On Tue, Sep 02, 2025 at 06:10:05PM +0200, Neil Armstrong wrote:
>>> Both bindings describe a different layout of the ports properties,
>>> leading to errors when validating DT using this PHY bindings as
>>> reported by Rob Herring.
>>>
>>> Reported-by: Rob Herring <robh@...nel.org>
>>> Closes: https://lore.kernel.org/all/175462129176.394940.16810637795278334342.robh@kernel.org/
>>> Fixes: 3bad7fe22796 ("dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Reference usb-switch.yaml to allow mode-switch")
>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>>> ---
>>>   .../devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml    | 8 +++++---
>>>   1 file changed, 5 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
>>> index c8bc512df08b5694c8599f475de78679a4438449..5005514d7c3a1e4a8893883497fd204bc04e12be 100644
>>> --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
>>> +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml
>>> @@ -73,8 +73,11 @@ properties:
>>>       description:
>>>         See include/dt-bindings/phy/phy-qcom-qmp.h
>>> -  mode-switch: true
>>> -  orientation-switch: true
>>> +  mode-switch:
>>> +    $ref: /schemas/usb/usb-switch.yaml#properties/mode-switch
>>> +
>>> +  orientation-switch:
>>> +    $ref: /schemas/usb/usb-switch.yaml#properties/orientation-switch
>>
>> This is a pattern we try to avoid with references at a property level. I
>> prefer you make port and ports not required in usb-switch.yaml.
> 
> Sure but the ports definitions will still collide in this case.
> 
> The other problem here is the difference in ports definition,
> port@0 and port@1 are not the same.
> 
> qcom,sc8280xp-qmp-usb43dp-phy.yaml:
>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>      properties:
>        port@0:
>          $ref: /schemas/graph.yaml#/properties/port
>          description: Output endpoint of the PHY
> 
>        port@1:
>          $ref: /schemas/graph.yaml#/properties/port
>          description: Incoming endpoint from the USB controller
> 
>        port@2:
>          $ref: /schemas/graph.yaml#/properties/port
>          description: Incoming endpoint from the DisplayPort controller
> 
> usb-switch.yaml:
>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>      properties:
>        port@0:
>          $ref: /schemas/graph.yaml#/properties/port
>          description:
>            Super Speed (SS) Output endpoint to the Type-C connector
> 
>        port@1:
>          $ref: /schemas/graph.yaml#/$defs/port-base
>          description:
>            Super Speed (SS) Input endpoint from the Super-Speed PHY

Do you have any advice how to solve this ? Requires is not the problem, the problem is to have the port
definitions in usb-switch.yaml

Neil

> 
> Neil
> 
>>
>> Rob
>