linux-kernel - Re: [PATCH v2 2/3] arm64: dts: qcom: sc7280: add lpass lpi pin controller node

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Date:   Thu, 10 Feb 2022 19:57:49 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>, <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 2/3] arm64: dts: qcom: sc7280: add lpass lpi pin
 controller node


On 2/10/2022 5:35 AM, Stephen Boyd wrote:
Thanks for Your time Stephen!!!
> Quoting Srinivasa Rao Mandadapu (2022-02-09 06:01:21)
>> On 2/9/2022 2:41 AM, Stephen Boyd wrote:
>>> Quoting Srinivasa Rao Mandadapu (2022-02-08 07:34:13)
>>>> +                       data {
>>>> +                               pins = "gpio7";
>>>> +                               function = "dmic1_data";
>>>> +                               drive-strength = <8>;
>>>> +                               input-enable;
>>>> +                       };
>>>> +               };
>>>> +
>>>> +               dmic01_sleep: dmic01-sleep-pins {
>>>> +                       clk {
>>>> +                               pins = "gpio6";
>>>> +                               function = "dmic1_clk";
>>>> +                               drive-strength = <2>;
>>>> +                               bias-disable;
>>>> +                               output-low;
>>>> +                       };
>>>> +
>>>> +                       data {
>>>> +                               pins = "gpio7";
>>>> +                               function = "dmic1_data";
>>>> +                               drive-strength = <2>;
>>>> +                               pull-down;
>>>> +                               input-enable;
>>> Why does input-enable matter? It's not a gpio.
>> Actually the same is fallowed in sm8250.dtsi. Verified without it and
>> working fine. Need take call on it.
> Is that because the pin is already an input by default? What does gpio
> debugfs say for this pin? Does it also work if you make it
> output-low/output-high here? I thought that the gpio itself isn't muxed
> out to the pad unless the function is "gpio" so I hope the input/output
> settings have no effect here.

Pin is in by default. debugfs says

gpio7 : in 1 8mA no pull

verified in downstream code also. Same is followed there also.