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

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Message-ID: <1a0be977-39b8-4089-a37e-dd378c03e476@oss.qualcomm.com>
Date: Mon, 12 May 2025 21:38:01 +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 5/8/25 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..

[...]

>>> +		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.

alright

Konrad