linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180: Add sleep state for alc5682 codec

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Date:   Thu, 18 Aug 2022 10:43:17 -0700
From:   Alexandru M Stan <amstan@...omium.org>
To:     "Joseph S. Barrera III" <joebar@...omium.org>
Cc:     linux-arm-msm@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Add sleep state for alc5682 codec

On Thu, Aug 18, 2022 at 8:42 AM Joseph S. Barrera III
<joebar@...omium.org> wrote:
>
> Add sleep state to acl5682. In default, gpio28 (HP_IRQ) is bias-pull-up.
> To save power, in the new sleep state, gpio28 is bias-disable.
>
> sleeping, /sys/kernel/debug/gpio shows gpio28 as "no pull". When codec
> is awake (microphone plugged in and in use), it shows gpio28 as "pull up".
>
> Signed-off-by: Joseph S. Barrera III <joebar@...omium.org>
> ---
>
>  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index b5f534db135a..94dd6c34d997 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -755,8 +755,9 @@ hp_i2c: &i2c9 {
>         alc5682: codec@1a {
>                 compatible = "realtek,rt5682i";
>                 reg = <0x1a>;
> -               pinctrl-names = "default";
> +               pinctrl-names = "default", "sleep";
>                 pinctrl-0 = <&hp_irq>;
> +               pinctrl-1 = <&hp_sleep>;
>
>                 #sound-dai-cells = <1>;
>
> @@ -1336,6 +1337,18 @@ pinconf {
>                 };
>         };
>
> +       hp_sleep: hp-sleep {
> +               pinmux {
> +                       pins = "gpio28";
> +                       function = "gpio";
> +               };
> +
> +               pinconf {
> +                       pins = "gpio28";
> +                       bias-disable;
> +               };
> +       };
> +
>         pen_irq_l: pen-irq-l {
>                 pinmux {
>                         pins = "gpio21";
> --
> 2.31.0
>

Thanks, this should save us a current leak.

Reviewed-by: Alexandru Stan <amstan@...omium.org>