linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sm8750: Add Soundwire nodes

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Message-ID: <fd92ae5f-2caf-408e-8a79-6338e6c8ea07@oss.qualcomm.com>
Date: Fri, 16 May 2025 13:36:03 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: sm8750: Add Soundwire nodes

On 5/13/25 10:26 AM, Krzysztof Kozlowski wrote:
> On 12/05/2025 21:38, Konrad Dybcio wrote:
>>>>>  arch/arm64/boot/dts/qcom/sm8750.dtsi | 122 +++++++++++++++++++++++++++++++++++
>>>>>  1 file changed, 122 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm8750.dtsi b/arch/arm64/boot/dts/qcom/sm8750.dtsi
>>>>> index 149d2ed17641a085d510f3a8eab5a96304787f0c..1e7aa25c675e76ce6aa571e04d7117b8c2ab25f8 100644
>>>>> --- a/arch/arm64/boot/dts/qcom/sm8750.dtsi
>>>>> +++ b/arch/arm64/boot/dts/qcom/sm8750.dtsi
>>>>> @@ -2257,6 +2257,36 @@ lpass_wsa2macro: codec@...0000 {
>>>>>  			#sound-dai-cells = <1>;
>>>>>  		};
>>>>>  
>>>>> +		swr3: soundwire@...0000 {
>>>>> +			compatible = "qcom,soundwire-v2.0.0";
>>>>
>>>> They're v2.1.0, same on 8650, there's a number of new registers
>>>
>>> Sorry, but no. This the "generic" compatible and it is correct. Devices
>>> expose versions, which is perfectly usable, thus changing compatible to
>>> different one is not useful. We could go with soc specific compatibles
>>> and new generic one, but what would that solve? This one is generic
>>> enough - the device is compatible with v2.0.
>>
>> Well, I'd expect a "2.1.0", "2.0.0" fallback there..
> 
> OK, let's see if any DT maintainer will ack such thing. :)

They sure did in e.g.

83adc98ec0d8 ("dt-bindings: dma: Add support for SM6115 and QCM2290 SoCs")

Konrad