linux-kernel - Re: [PATCH v6 1/2] arm64: dts: qcom: sc7280: Add pinmux for I2S speaker and Headset

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Date:   Tue, 5 Apr 2022 11:34:33 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_rohitkr@...cinc.com,
        srinivas.kandagatla@...aro.org, dianders@...omium.org,
        swboyd@...omium.org, judyhsiao@...omium.org,
        Venkata Prasad Potturu <quic_potturu@...cinc.com>
Subject: Re: [PATCH v6 1/2] arm64: dts: qcom: sc7280: Add pinmux for I2S
 speaker and Headset

On Tue, Apr 05, 2022 at 04:42:46PM +0530, Srinivasa Rao Mandadapu wrote:
> Add AMP enable node and pinmux for primary and secondary I2S
> for SC7280 based platforms.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> Co-developed-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
> Signed-off-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 34 +++++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi       | 20 +++++++++++++
>  arch/arm64/boot/dts/qcom/sc7280.dtsi           | 41 ++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
> index dc17f20..de646d9 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
> @@ -530,6 +530,26 @@ ap_ec_spi: &spi10 {
>  	drive-strength = <2>;
>  };
>  
> +&pri_mi2s_data0 {
> +	drive-strength = <6>;

Isn't this pin used as an input (HP_DIN)? Is specifying the drive strength
really needed?

> +};
> +
> +&pri_mi2s_data1 {
> +	drive-strength = <6>;
> +};
> +
> +&pri_mi2s_mclk {
> +	drive-strength = <6>;
> +};
> +
> +&pri_mi2s_sclk {
> +	drive-strength = <6>;
> +};
> +
> +&pri_mi2s_ws {
> +	drive-strength = <6>;
> +};
> +
>  &qspi_cs0 {
>  	bias-disable;
>  	drive-strength = <8>;
> @@ -610,6 +630,20 @@ ap_ec_spi: &spi10 {
>  	drive-strength = <10>;
>  };
>  
> +&sec_mi2s_data0 {
> +	drive-strength = <6>;
> +	bias-disable;
> +};
> +
> +&sec_mi2s_sclk {
> +	drive-strength = <6>;
> +	bias-disable;
> +};
> +
> +&sec_mi2s_ws {
> +	drive-strength = <6>;
> +};

Actually there are several sound configs for herobrine boards. For now I
think it's ok to specify the config for herobrine -rev1 (as this patch
does) and we can sort out later how to best support the different configs.

>  /* PINCTRL - board-specific pinctrl */
>  
>  &pm7325_gpios {
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index ecbf2b8..2afbbe3 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -462,7 +462,27 @@
>  	drive-strength = <10>;
>  };
>  
> +&sec_mi2s_data0 {
> +	drive-strength = <6>;
> +	bias-disable;
> +};
> +
> +&sec_mi2s_sclk {
> +	drive-strength = <6>;
> +	bias-disable;
> +};
> +
> +&sec_mi2s_ws {
> +	drive-strength = <6>;
> +};
> +
>  &tlmm {
> +	amp_en: amp-en {
> +		pins = "gpio63";
> +		bias-pull-down;
> +		drive-strength = <2>;
> +	};

nit: all the other pins are i2s related, it might make sense to add amp_en
in a separate patch.

> +
>  	bt_en: bt-en {
>  		pins = "gpio85";
>  		function = "gpio";
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index f0b64be..8d8cec5 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -3527,6 +3527,31 @@
>  				function = "pcie1_clkreqn";
>  			};
>  
> +			pri_mi2s_data0: pri-mi2s-data0 {
> +				pins = "gpio98";
> +				function = "mi2s0_data0";
> +			};
> +
> +			pri_mi2s_data1: pri-mi2s-data1 {
> +				pins = "gpio99";
> +				function = "mi2s0_data1";
> +			};
> +
> +			pri_mi2s_mclk: pri-mi2s-mclk {
> +				pins = "gpio96";
> +				function = "pri_mi2s";
> +			};
> +
> +			pri_mi2s_sclk: pri-mi2s-sclk {
> +				pins = "gpio97";
> +				function = "mi2s0_sck";
> +			};
> +
> +			pri_mi2s_ws: pri-mi2s-ws {
> +				pins = "gpio100";
> +				function = "mi2s0_ws";
> +			};
> +
>  			qspi_clk: qspi-clk {
>  				pins = "gpio14";
>  				function = "qspi_clk";
> @@ -4261,6 +4286,22 @@
>  				drive-strength = <2>;
>  				bias-bus-hold;
>  			};
> +
> +			sec_mi2s_data0: sec-mi2s-data0 {
> +				pins = "gpio107";
> +				function = "mi2s1_data0";
> +			};
> +
> +			sec_mi2s_sclk: sec-mi2s-sclk {
> +				pins = "gpio106";
> +				function = "mi2s1_sck";
> +			};
> +
> +			sec_mi2s_ws: sec-mi2s-ws {
> +				pins = "gpio108";
> +				function = "mi2s1_ws";
> +			};

Is there a particular reason for the pri/sec nomenclature? The datasheet and
schematics call the pin mi2sN_xyz, it seems it would be clearer to follow
that naming. Primary/secondary seems to imply a 'master/slave' topology, but
these are independent controllers IIUC. The datasheet refers to pin 96 as
PRI_MI2S_MCLK and pin 105 SEC_MI2S_MCLK, I guess the naming was derived from
that.

My suggestion would be to follow the naming in the datasheet/schematic, i.e.
mi2sN_data0, mi2sN_data1, pri/sec_mi2s_mclk, mi2sN_sck, mi2sN_ws.