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

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Message-ID: <afda790f-0b5e-4569-a92b-904df936df85@linaro.org>
Date: Thu, 8 May 2025 12:37:13 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: 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 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.


> 
> [...]
> 
> 
>> +		swr2: soundwire@...0000 {
>> +			compatible = "qcom,soundwire-v2.0.0";
>> +			reg = <0 0x07630000 0 0x10000>;
>> +			interrupts = <GIC_SPI 761 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 785 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-names = "core", "wakeup";
>> +			clocks = <&lpass_txmacro>;
>> +			clock-names = "iface";
>> +			label = "TX";
>> +
>> +			pinctrl-0 = <&tx_swr_active>;
>> +			pinctrl-names = "default";
>> +
>> +			qcom,din-ports = <4>;
>> +			qcom,dout-ports = <0>;
> 
> There's 1 OUT port on this instance
> 
> otherwise (modulo the settings I don't have a reference for)

Omitted on purpose, no port configuration available.


Best regards,
Krzysztof