linux-kernel - Re: [PATCH 1/6] dt-bindings: usb: dwc3: Document usb-soc-be property

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Message-Id: <D9I3JK9RAP0C.NT3K81FYMLCR@fairphone.com>
Date: Mon, 28 Apr 2025 09:34:11 +0200
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Wesley Cheng" <quic_wcheng@...cinc.com>, "Greg Kroah-Hartman"
 <gregkh@...uxfoundation.org>, "Rob Herring" <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>,
 "Felipe Balbi" <balbi@...nel.org>, "Srinivas Kandagatla"
 <srini@...nel.org>, "Liam Girdwood" <lgirdwood@...il.com>, "Mark Brown"
 <broonie@...nel.org>, "Jaroslav Kysela" <perex@...ex.cz>, "Takashi Iwai"
 <tiwai@...e.com>, "Bjorn Andersson" <andersson@...nel.org>, "Konrad Dybcio"
 <konradybcio@...nel.org>, "Stephan Gerhold" <stephan.gerhold@...aro.org>
Cc: <~postmarketos/upstreaming@...ts.sr.ht>, <phone-devel@...r.kernel.org>,
 <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, "Krzysztof Kozlowski"
 <krzysztof.kozlowski@...aro.org>, <linux-arm-msm@...r.kernel.org>,
 <linux-sound@...r.kernel.org>
Subject: Re: [PATCH 1/6] dt-bindings: usb: dwc3: Document usb-soc-be
 property

On Fri Apr 25, 2025 at 11:39 PM CEST, Wesley Cheng wrote:
>
>
> On 4/25/2025 3:44 AM, Luca Weiss wrote:
>> The property usb-soc-be is used by the new SoC USB layer which is used
>> for USB audio offloading on Qualcomm SoCs.
>
> Hi Luca,
>
> This property can be dropped now, as in the latest revision I added
> utilizing the auxiliary device/bus now between the Q6USB backend DAI and
> the vendor USB offload driver.  Reduces the need to add more properties.

Great, thanks for letting me know! Will remove it in v2.

I see the code in sound/soc/soc-usb.c is still parsing 'usb-soc-be', is
that now kept for other use cases or should that be removed as well?

Regards
Luca

>
> Thanks
> Wesley Cheng
>
>> 
>> Cc: Wesley Cheng <quic_wcheng@...cinc.com>
>> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
>> ---
>>  Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml | 4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
>> index 6c0b8b6538246adf746fe7ccd6df936131c61444..07549dec0f74234465fa9b6ab21871762a2f5127 100644
>> --- a/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
>> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3-common.yaml
>> @@ -38,6 +38,10 @@ properties:
>>        - description: USB2/HS PHY
>>        - description: USB3/SS PHY
>>  
>> +  usb-soc-be:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description: Link to the USB SoC sound backend
>> +
>>    phys:
>>      minItems: 1
>>      maxItems: 19
>>