linux-kernel - Re: [PATCH v5 3/3] arm64: dts: qcom: sc7280: add lpass lpi pin controller node

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Date:   Mon, 21 Mar 2022 21:26:28 +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 3/3] arm64: dts: qcom: sc7280: add lpass lpi pin
 controller node

Quoting Srinivasa Rao Mandadapu (2022-03-21 04:59:19)
> Add LPASS LPI pinctrl node required for Audio functionality 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.dtsi | 147 +++++++++++++++++++++++++++++++++++
>  1 file changed, 147 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 8d8cec5..499299a 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -1987,6 +1987,153 @@
>                         qcom,bcm-voters = <&apps_bcm_voter>;
>                 };
>
> +               lpass_tlmm: pinctrl@...0000 {
> +                       compatible = "qcom,sc7280-lpass-lpi-pinctrl";
> +                       reg = <0 0x33c0000 0x0 0x20000>,
> +                               <0 0x3550000 0x0 0x10000>;
> +                       gpio-controller;
> +                       #gpio-cells = <2>;
> +                       gpio-ranges = <&lpass_tlmm 0 0 15>;
> +
> +                       #clock-cells = <1>;
> +
> +                       dmic01_active: dmic01-active {
> +                               clk {
> +                                       pins = "gpio6";
> +                                       function = "dmic1_clk";
> +                                       drive-strength = <8>;
> +                                       output-high;

The rule of thumb is that drive strength, output/input, and bias
properties should be in the board file, because the board layout decides
the drive strength, the output level could be inverted on the board, and
the biasing could be done externally (or not) via pullup/pulldowns on
the net. The gpio driver should be able to make pins into inputs
automatically when the gpio is requested and used so having input or
output is typically wrong and should be handled by the consumer driver.

> +                               };
> +
> +                               data {
> +                                       pins = "gpio7";
> +                                       function = "dmic1_data";

So in the end I'd expect to only see pins and function properties in the
SoC dtsi file.

> +                                       drive-strength = <8>;
> +                               };
> +                       };
> +
> +                       dmic01_sleep: dmic01-sleep {
> +                               clk {
> +                                       pins = "gpio6";
> +                                       function = "dmic1_clk";