linux-kernel - Re: [PATCH v5 2/3] arm64: dts: qcom: sc7280: Add pinmux for I2S speaker and Headset

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Date:   Mon, 21 Mar 2022 21:30:16 +0100
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 v5 2/3] arm64: dts: qcom: sc7280: Add pinmux for I2S
 speaker and Headset

Quoting Srinivasa Rao Mandadapu (2022-03-21 04:59:18)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index 688fa95..4a7b18a 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -462,7 +462,28 @@
>         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";
> +               function = "gpio";

I'm pretty sure 'function = "gpio"' isn't needed. When a gpio is
requested with gpio functions it gets muxed to gpio function
automatically. See commit 1de7ddb3a15c ("pinctrl: msm: Mux out gpio
function with gpio_request()").

> +               bias-pull-down;
> +               drive-strength = <2>;
> +       };
> +
>         bt_en: bt-en {
>                 pins = "gpio85";
>                 function = "gpio";