linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: sc7280: Add pm8008 regulators support for sc7280-idp

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Date:   Tue, 28 Sep 2021 18:12:13 +0530
From:   skakit@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, mka@...omium.org,
        Das Srinagesh <gurus@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>, kgunda@...eaurora.org,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: qcom: sc7280: Add pm8008 regulators
 support for sc7280-idp

On 2021-09-21 01:07, Stephen Boyd wrote:
> Quoting Satya Priya (2021-09-17 03:45:38)
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> index 52638e2..3b3af49 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> @@ -207,6 +207,97 @@
>>         };
>>  };
>> 
>> +&i2c1 {
>> +       #address-cells = <1>;
>> +       #size-cells = <0>;
>> +       status = "okay";
>> +
>> +       pm8008_chip: pm8008@8 {
>> +               compatible = "qcom,pm8008";
>> +               reg = <0x8>;
>> +               #address-cells = <1>;
>> +               #size-cells = <0>;
>> +
>> +               pinctrl-names = "default";
>> +               pinctrl-0 = <&pm8008_active>;
>> +       };
>> +
>> +       pm8008_ldo: pm8008@9 {
> [...]
>> +
>> +                       pm8008_l7: regulator@...0 {
>> +                               reg = <0x4600>;
>> +                               regulator-name = "pm8008_l7";
>> +                               regulator-min-microvolt = <3000000>;
>> +                               regulator-max-microvolt = <3544000>;
>> +                               qcom,min-dropout-voltage = <96000>;
> 
> Is this headroom? Is it actually configurable or is it merely a 
> property
> of the hardware? If it's the latter then it should be in the driver and
> not in the DTS.
> 

Yes this is a headroom and its configurable.

>> +                       };
>> +               };
>> +       };
>> +};
>> +
>>  &qfprom {
>>         vcc-supply = <&vreg_l1c_1p8>;
>>  };
>> @@ -313,6 +404,18 @@
>> 
>>  /* PINCTRL - additions to nodes defined in sc7280.dtsi */
>> 
>> +&pm8350c_gpios {
>> +       pm8008_reset {
> 
> Is this a pinctrl node?
> 

No.

>> +               pm8008_active: pm8008_active {
> 
> Please use dashes in node names wherever an underscore goes.
> 

Okay.

>> +                       pins = "gpio4";
>> +                       function = "normal";
>> +                       bias-disable;
>> +                       output-high;
>> +                       power-source = <0>;
>> +               };
>> +       };
>> +};