linux-kernel - Re: [PATCH 1/8] dt-bindings: soc: qcom: eud: Add phy related bindings

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Message-ID: <5275651f-4075-4dac-bba0-da88f5836459@quicinc.com>
Date: Wed, 31 Jul 2024 15:23:37 -0700
From: Elson Serrao <quic_eserrao@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <gregkh@...uxfoundation.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 1/8] dt-bindings: soc: qcom: eud: Add phy related bindings



On 7/30/2024 10:33 PM, Krzysztof Kozlowski wrote:
> On 31/07/2024 00:24, Elson Roy Serrao wrote:
>> Embedded USB Debugger(EUD) being a High-Speed USB  hub needs
>> HS-Phy support for it's operation. Hence document phy bindings
>> to support this.
>>
>> Signed-off-by: Elson Roy Serrao <quic_eserrao@...cinc.com>
> 
> A nit, subject: drop second/last, redundant "bindings". The
> "dt-bindings" prefix is already stating that these are bindings.
> See also:
> https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18
> 
Ack
>> ---
>>  .../devicetree/bindings/soc/qcom/qcom,eud.yaml       | 12 ++++++++++++
>>  1 file changed, 12 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>> index f2c5ec7e6437..fca5b608ec63 100644
>> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml
>> @@ -29,6 +29,14 @@ properties:
>>      description: EUD interrupt
>>      maxItems: 1
>>  
>> +  phys:
>> +    items:
>> +      - description: USB2/HS PHY needed for EUD functionality
>> +
>> +  phy-names:
>> +    items:
>> +      - const: usb2-phy
>> +
>>    ports:
>>      $ref: /schemas/graph.yaml#/properties/ports
>>      description:
>> @@ -48,6 +56,8 @@ properties:
>>  required:
>>    - compatible
>>    - reg
>> +  - phys
>> +  - phy-names
> 
> That's an ABI break and nothing in commit msg justified it.
> 

Hi Krzysztof

Thank you for the review.
I see that the only user for EUD as of now is QC sc7280 SoC where phy property
is missing and EUD node is disabled. As described in my cover letter, HS phy
support is needed for EUD functionality and this is applicable to all SoCs
where EUD is to be enabled. Hence phy would be a required property.
Given that the changes in this series are directly applicable to sc7280 as well,
I will re-enable/rectify EUD feature on sc7280 SoC first, by adhering it to this binding
requirement. That would address the ABI break. 
Once the base framework is set I shall extend it to sm8450 SoC.

Regards
Elson