linux-kernel - Re: [PATCH 1/4] dt-bindings: usb: typec: add bindings for stm32g0 controller

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Date:   Mon, 4 Jul 2022 11:08:22 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <robh+dt@...nel.org>
CC:     <krzysztof.kozlowski+dt@...aro.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <amelie.delaunay@...s.st.com>, <alexandre.torgue@...s.st.com>,
        <gregkh@...uxfoundation.org>, <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH 1/4] dt-bindings: usb: typec: add bindings for stm32g0
 controller

On 7/4/22 09:55, Krzysztof Kozlowski wrote:
> On 01/07/2022 12:04, Fabrice Gasnier wrote:
>>
>> Then I no longer get this warning upon build. But the dtbs_check complains:
>> ---
>> connector: ports: 'port@0' is a required property
>> 	From schema: ..
>> Documentation/devicetree/bindings/connector/usb-connector.yaml
>>
>> So It looks like to me there's something missing to handle the single
>> port case in usb-connector.yaml, when using the "ports".
>>
>> Maybe usb-connector could be updated to handle "port" (w/o unit-addr) ?
> 
> Not really, the dtc warning looks false-positive. Especially that you
> need port@1 for USB 3.0 (super speed), unless you do not support it?

Hi Krzysztof,

Having USB2.0 High speed port only is perfectly valid. port@1 is
optional to support USB3.0 as you mention.

I've no opinion regarding a possible false positive warning. I'd like to
sort this out, perhaps Rob has some recommendation regarding this ?

Please advise,
Best regards,
Fabrice

> 
>> I'm talking about:
>>     required:
>>       - port@0
>>
>> So, I came up with:
>>
>> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
>> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
>> @@ -176,6 +176,9 @@ properties:
>>        port number as described below.
>>
>>      properties:
>> +      port:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +
>>        port@0:
>>          $ref: /schemas/graph.yaml#/properties/port
>>          description: High Speed (HS), present in all connectors.
>> @@ -189,8 +192,11 @@ properties:
>>          description: Sideband Use (SBU), present in USB-C. This
>> describes the
>>            alternate mode connection of which SBU is a part.
>>
>> -    required:
>> -      - port@0
>> +    oneOf:
>> +      - required:
>> +          - port
>> +      - required:
>> +          - port@0
>>
>>
>> Do you agree on this approach ? (I can add a pre-cursor patch to this
>> series, to handle the single port case)
> 
> 
> 
> Best regards,
> Krzysztof