linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sc7280: add sound card support

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Date:   Wed, 5 Jan 2022 13:10:00 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        agross@...nel.org, bjorn.andersson@...aro.org,
        devicetree@...r.kernel.org, dianders@...omium.org,
        judyhsiao@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        rohitkr@...eaurora.org, srinivas.kandagatla@...aro.org
Cc:     Venkata Prasad Potturu <quic_potturu@...cinc.com>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: sc7280: add sound card support

Quoting Srinivasa Rao Mandadapu (2022-01-03 03:13:00)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index 3449d56..63b1184 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -637,6 +637,99 @@
>         };
>  };
>
> +&sound {
> +       compatible = "google,sc7280-herobrine";
> +       model = "sc7280-wcd938x-max98360a-1mic";
> +       status = "okay";
> +       audio-routing =
> +               "IN1_HPHL", "HPHL_OUT",
> +               "IN2_HPHR", "HPHR_OUT",
> +               "AMIC1", "MIC BIAS1",
> +               "AMIC2", "MIC BIAS2",
> +               "VA DMIC0", "MIC BIAS3",
> +               "VA DMIC1", "MIC BIAS3",
> +               "VA DMIC2", "MIC BIAS1",
> +               "VA DMIC3", "MIC BIAS1",
> +               "TX SWR_ADC0", "ADC1_OUTPUT",
> +               "TX SWR_ADC1", "ADC2_OUTPUT",
> +               "TX SWR_ADC2", "ADC3_OUTPUT",
> +               "TX SWR_DMIC0", "DMIC1_OUTPUT",
> +               "TX SWR_DMIC1", "DMIC2_OUTPUT",
> +               "TX SWR_DMIC2", "DMIC3_OUTPUT",
> +               "TX SWR_DMIC3", "DMIC4_OUTPUT",
> +               "TX SWR_DMIC4", "DMIC5_OUTPUT",
> +               "TX SWR_DMIC5", "DMIC6_OUTPUT",
> +               "TX SWR_DMIC6", "DMIC7_OUTPUT",
> +               "TX SWR_DMIC7", "DMIC8_OUTPUT";
> +
> +               qcom,msm-mbhc-hphl-swh = <1>;
> +               qcom,msm-mbhc-gnd-swh = <1>;

Why are these last extra tabbed?

> +
> +       #address-cells = <1>;
> +       #size-cells = <0>;
> +       #sound-dai-cells = <0>;
> +
> +       dai-link@6 {
> +               link-name = "WCD Playback";
> +               reg = <LPASS_CDC_DMA_RX0>;
> +               cpu {
> +                       sound-dai = <&lpass_cpu LPASS_CDC_DMA_RX0>;
> +               };
> +
> +               codec {
> +                       sound-dai = <&wcd938x 0>, <&swr0 0>, <&rxmacro 0>;
> +               };
> +       };
> +
> +       dai-link@19 {
> +               link-name = "WCD Capture";
> +               reg = <LPASS_CDC_DMA_TX3>;
> +               cpu {
> +                       sound-dai = <&lpass_cpu LPASS_CDC_DMA_TX3>;
> +               };
> +
> +               codec {
> +                       sound-dai = <&wcd938x 1>, <&swr1 0>, <&txmacro 0>;
> +               };
> +       };
> +
> +       dai-link@1 {
> +               link-name = "Secondary MI2S Playback";
> +               reg = <MI2S_SECONDARY>;
> +               cpu {
> +                       sound-dai = <&lpass_cpu MI2S_SECONDARY>;
> +               };
> +
> +               codec {
> +                       sound-dai = <&max98360a>;
> +               };
> +       };
> +
> +       dai-link@5 {
> +               link-name = "DP Playback";
> +               reg = <LPASS_DP_RX>;
> +               cpu {
> +                       sound-dai = <&lpass_cpu LPASS_DP_RX>;
> +               };
> +
> +               codec {
> +                               sound-dai = <&msm_dp>;

Why double tabbed?

> +               };
> +       };
> +
> +       dai-link@25 {
> +               link-name = "DMIC Capture";
> +               reg = <LPASS_CDC_DMA_VA_TX0>;
> +               cpu {
> +                       sound-dai = <&lpass_cpu LPASS_CDC_DMA_VA_TX0>;
> +               };
> +
> +               codec {
> +                       sound-dai = <&vamacro 0>;
> +               };
> +       };

The order of the nodes seems arbitrary. Is there any sort order that can
be used to avoid conflicts in the future? Maybe the reg property because
that's how we sort the SoC node.

> +};
> +
>  &swr0 {
>         wcd_rx: wcd938x-rx{
>                 compatible = "sdw20217010d00";
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 68c7755..57bc5ef 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -2786,6 +2786,9 @@
>
>                 };
>
> +               sound: sound {

Is this really necessary? Certainly it shouldn't be in the SoC node as
it doesn't have a reg property.

> +               };
> +
>                 usb_1_hsphy: phy@...3000 {
>                         compatible = "qcom,sc7280-usb-hs-phy",
>                                      "qcom,usb-snps-hs-7nm-phy";
> --
> 2.7.4
>