linux-kernel - Re: [PATCH 2/6] arm64: dts: qcom: sc8280xp: disable sound nodes

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Date:   Mon, 2 Jan 2023 13:29:38 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] arm64: dts: qcom: sc8280xp: disable sound nodes

On 02/01/2023 11:50, Johan Hovold wrote:
> The sound nodes in the SoC dtsi should be disabled by default.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> index ed1e2bee86ee..c1ce2d7b3675 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> @@ -1733,6 +1733,8 @@ rxmacro: rxmacro@...0000 {
>  
>  			pinctrl-names = "default";
>  			pinctrl-0 = <&rx_swr_default>;
> +
> +			status = "disabled";

There is no reason this should be disabled by default. No external (per
board) configuration is needed and by default SoC components should be
enabled if they do not need anything from the board.

>  		};
>  
>  		/* RX */
> @@ -1760,6 +1762,8 @@ swr1: soundwire-controller@...0000 {
>  			#sound-dai-cells = <1>;
>  			#address-cells = <2>;
>  			#size-cells = <0>;
> +
> +			status = "disabled";

For soundwires disabling makes sense - these are busses so they need to
be explicitly enabled and populated with children.

>  		};
>  
>  		txmacro: txmacro@...0000 {
> @@ -1783,6 +1787,8 @@ txmacro: txmacro@...0000 {
>  			#address-cells = <2>;
>  			#size-cells = <2>;
>  			#sound-dai-cells = <1>;
> +
> +			status = "disabled";
>  		};
>  
>  		wsamacro: codec@...0000 {
> @@ -1804,6 +1810,8 @@ wsamacro: codec@...0000 {
>  
>  			pinctrl-names = "default";
>  			pinctrl-0 = <&wsa_swr_default>;
> +
> +			status = "disabled";
>  		};
>  
>  		/* WSA */
> @@ -1830,6 +1838,8 @@ swr0: soundwire-controller@...0000 {
>  			#sound-dai-cells = <1>;
>  			#address-cells = <2>;
>  			#size-cells = <0>;
> +
> +			status = "disabled";
>  		};
>  
>  		/* TX */
> @@ -1858,6 +1868,8 @@ swr2: soundwire-controller@...0000 {
>  			qcom,ports-word-length =	/bits/ 8 <0xff 0x00 0xff 0xff>;
>  			qcom,ports-block-group-count =	/bits/ 8 <0xff 0xff 0xff 0xff>;
>  			qcom,ports-lane-control =	/bits/ 8 <0x00 0x01 0x00 0x00>;
> +
> +			status = "disabled";
>  		};
>  
>  		vamacro: codec@...0000 {
> @@ -1874,6 +1886,8 @@ vamacro: codec@...0000 {
>  			#clock-cells = <0>;
>  			clock-output-names = "fsgen";
>  			#sound-dai-cells = <1>;
> +
> +			status = "disabled";

vamacro needs supply from the board so this one also makes sense.

Best regards,
Krzysztof