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

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Date:   Wed, 9 Feb 2022 19:56:58 +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 3/3] arm64: dts: qcom: sc7280: Add wcd9380 pinmux


On 2/9/2022 2:42 AM, Stephen Boyd wrote:
Thanks for your time Stephen!!!
> 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.
Okay. will remove it.
>
>> +                       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.
Okay. Verified without these nodes and didn't see any impact. But 
similar way it's mentioned in sm8250-mtp.dts. Could You please suggest 
on it how to go ahead on this?.