linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc7280: Move wcd specific pin conf to common file

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Date:   Fri, 8 Jul 2022 10:59:11 -0700
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, quic_rohkumar@...cinc.com,
        robh+dt@...nel.org, srinivas.kandagatla@...aro.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sc7280: Move wcd specific pin conf
 to common file

Quoting Srinivasa Rao Mandadapu (2022-07-07 05:36:21)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-audio-wcd9385.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-audio-wcd9385.dtsi
> index 32a1e78..859faaa 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-audio-wcd9385.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-audio-wcd9385.dtsi
> @@ -5,6 +5,70 @@
>   * Copyright (c) 2022, The Linux Foundation. All rights reserved.
>   */
>
> +/* PINCTRL */
> +
> +&lpass_dmic01_clk {
> +       drive-strength = <8>;
> +       bias-disable;
> +};
> +
> +&lpass_dmic01_clk_sleep {
> +       drive-strength = <2>;
> +};
> +
> +&lpass_dmic01_data {
> +       bias-pull-down;
> +};
> +
> +&lpass_dmic23_clk {
> +       drive-strength = <8>;
> +       bias-disable;
> +};
> +
> +&lpass_dmic23_clk_sleep {
> +       drive-strength = <2>;
> +};
> +
> +&lpass_dmic23_data {
> +       bias-pull-down;
> +};
> +
> +&lpass_rx_swr_clk {
> +       drive-strength = <2>;
> +       slew-rate = <1>;
> +       bias-disable;
> +};
> +
> +&lpass_rx_swr_clk_sleep {
> +       bias-pull-down;
> +};
> +
> +&lpass_rx_swr_data {
> +       drive-strength = <2>;

I suspect this was discussed before, but why do we need to modify drive
strengths on pins that aren't in output mode? I assume either rx_swr or
tx_swr is unidirectional.

> +       slew-rate = <1>;
> +       bias-bus-hold;
> +};
> +
> +&lpass_rx_swr_data_sleep {
> +       bias-pull-down;
> +};
> +
> +&lpass_tx_swr_clk {
> +       drive-strength = <2>;
> +       slew-rate = <1>;
> +       bias-disable;
> +};
> +
> +&lpass_tx_swr_clk_sleep {
> +       bias-pull-down;
> +};
> +
> +&lpass_tx_swr_data {
> +       drive-strength = <2>;
> +       slew-rate = <1>;
> +       bias-bus-hold;
> +};
> +
>  &mi2s1_data0 {
>         drive-strength = <6>;
>         bias-disable;