Re: [PATCH v8 4/4] arm64: dts: qcom: sc7280: Add dt nodes for sound card

[Matthias Kaehlcke <mka@chromium.org>]

On Mon, Apr 18, 2022 at 07:44:12PM +0530, Srinivasa Rao Mandadapu wrote:
> Add dt nodes for sound card support, which is using WCD938x headset
> playback, capture, I2S speaker playback and DMICs via VA macro.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
> Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
> Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts | 23 ++++++++
>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi   | 93 ++++++++++++++++++++++++++++++
>  2 files changed, 116 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts b/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> index aa0bf6e2..bf15bbe 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> @@ -87,6 +87,29 @@ ap_ts_pen_1v8: &i2c13 {
>  	pins = "gpio51";
>  };
>  
> +&sound {
> +	audio-routing =
> +		"IN1_HPHL", "HPHL_OUT",
> +		"IN2_HPHR", "HPHR_OUT",
> +		"AMIC1", "MIC BIAS1",
> +		"AMIC2", "MIC BIAS2",
> +		"VA DMIC0", "MIC BIAS1",
> +		"VA DMIC1", "MIC BIAS1",
> +		"VA DMIC2", "MIC BIAS3",
> +		"VA DMIC3", "MIC BIAS3",
> +		"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";
> +};

Should this also be added to sc7280-herobrine-crd.dts?

> +
>  &wcd938x {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&us_euro_hs_sel>;
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index e880837..640b1338 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -85,6 +85,99 @@
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&nvme_pwren>;
>  	};
> +
> +	sound: sound {
> +		compatible = "google,sc7280-herobrine";
> +		model = "sc7280-wcd938x-max98360a-1mic";
> +
> +		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>;
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		#sound-dai-cells = <0>;
> +
> +		dai-link@1 {

The '@1' is the address of the lpass CPU DAI, which doesn't seem correct
here. As I brought up on v7 [1] I think this value isn't even necessarily
unique, a SoC could have multiple IP blocks with audio buses, each with
their own DAI address space. The binding (currently) requires an
'address'/id, rather than using the CPU DAI id I suggest to enumerate the
links linearly, starting with 0.

[1] https://patchwork.kernel.org/project/linux-arm-msm/patch/1649863277-31615-5-git-send-email-quic_srivasam@quicinc.com/

> +			link-name = "MAX98360A";

The binding requires a 'reg' property, even though it isn't used (also
discussed on v7). I think the 'reg' property should be removed from the
binding and the DTs that use it, but maybe that should be done in a
separate series. In the meantime the value should match that of the
node.

> +
> +			cpu {
> +				sound-dai = <&lpass_cpu MI2S_SECONDARY>;
> +			};
> +
> +			codec {
> +				sound-dai = <&max98360a>;
> +			};
> +		};
> +
> +		dai-link@5 {
> +			link-name = "DisplayPort";
> +
> +			cpu {
> +				sound-dai = <&lpass_cpu LPASS_DP_RX>;
> +			};
> +
> +			codec {
> +				sound-dai = <&mdss_dp>;
> +			};
> +		};
> +
> +		dai-link@6 {
> +			link-name = "WCD9385 Playback";
> +
> +			cpu {
> +				sound-dai = <&lpass_cpu LPASS_CDC_DMA_RX0>;
> +			};
> +
> +			codec {
> +				sound-dai = <&wcd938x 0>, <&swr0 0>, <&lpass_rx_macro 0>;
> +			};
> +		};
> +
> +		dai-link@19 {
> +			link-name = "WCD9385 Capture";
> +
> +			cpu {
> +				sound-dai = <&lpass_cpu LPASS_CDC_DMA_TX3>;
> +			};
> +
> +			codec {
> +				sound-dai = <&wcd938x 1>, <&swr1 0>, <&lpass_tx_macro 0>;
> +			};
> +		};
> +
> +		dai-link@25 {
> +			link-name = "DMIC";
> +
> +			cpu {
> +				sound-dai = <&lpass_cpu LPASS_CDC_DMA_VA_TX0>;
> +			};
> +
> +			codec {
> +				sound-dai = <&lpass_va_macro 0>;
> +			};
> +		};
> +	};
>  };
>  
>  &apps_rsc {
> -- 
> 2.7.4
>