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

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Message-ID: <nr7sxs3bbacbrengxfnnmk2qpyajyazxkkzckcssm2ztbdsrdu@22w74cmrjf3r>
Date: Sat, 17 May 2025 00:46:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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>, 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 Mon, May 12, 2025 at 09:38:01PM +0200, Konrad Dybcio wrote:
> On 5/8/25 12:37 PM, Krzysztof Kozlowski wrote:
> > On 25/04/2025 11:24, Konrad Dybcio wrote:
> >> On 4/24/25 11:40 AM, Krzysztof Kozlowski wrote:
> >>> Add Soundwire controllers on SM8750, fully compatible with earlier
> >>> SM8650 generation.
> >>>
> >>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >>> ---
> >>>  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..

+1. I think there should be a version-specific entry in addition to the
fallback.

-- 
With best wishes
Dmitry