linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sc7280: Add wcd9380 pinmux

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Date:   Tue, 8 Feb 2022 13:12:54 -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 wcd9380 pinmux

Quoting Srinivasa Rao Mandadapu (2022-02-08 07:34:14)
> Add pinmux to reset wcd codec, conneceted on 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-idp.dtsi | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index 4704a93..6b38fa1 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -594,6 +594,21 @@
>                  */
>                 bias-pull-up;
>         };
> +
> +       wcd938x_reset_active: wcd938x_reset_active {

No underscore in node names.

> +                       pins = "gpio83";
> +                       function = "gpio";
> +                       drive-strength = <16>;
> +                       output-high;
> +       };
> +
> +       wcd938x_reset_sleep: wcd938x_reset_sleep {
> +                       pins = "gpio83";
> +                       function = "gpio";
> +                       drive-strength = <16>;
> +                       bias-disable;
> +                       output-low;

Why doesn't the device drive the reset gpio by requesting the gpio and
asserting and deasserting it? We shouldn't need to use pinctrl settings
to toggle reset gpios.