linux-kernel - Re: [PATCH v2 4/4] ARM: dts: axp22x/axp809: Add GPIO controller nodes

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Date:   Thu, 15 Sep 2022 23:16:47 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     wens@...e.org
Cc:     Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v2 4/4] ARM: dts: axp22x/axp809: Add GPIO controller nodes

On 6/26/22 08:03, Chen-Yu Tsai wrote:
> On Tue, Jun 21, 2022 at 11:42 AM Samuel Holland <samuel@...lland.org> wrote:
>>
>> These PMICs all contain a GPIO controller. Now that the binding is
>> documented, wire up the controller in the device tree.
>>
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>
>> (no changes since v1)
>>
>>  arch/arm/boot/dts/axp22x.dtsi | 18 ++++++++++++++++++
>>  arch/arm/boot/dts/axp809.dtsi | 19 +++++++++++++++++++
>>  2 files changed, 37 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/axp22x.dtsi b/arch/arm/boot/dts/axp22x.dtsi
>> index a020c12b2884..5c233c84be92 100644
>> --- a/arch/arm/boot/dts/axp22x.dtsi
>> +++ b/arch/arm/boot/dts/axp22x.dtsi
>> @@ -67,6 +67,24 @@ battery_power_supply: battery-power {
>>                 status = "disabled";
>>         };
>>
>> +       axp_gpio: gpio {
>> +               compatible = "x-powers,axp221-gpio";
>> +               gpio-controller;
>> +               #gpio-cells = <2>;
>> +
>> +               /omit-if-no-ref/
>> +               gpio0_ldo: gpio0-ldo-pin {
>> +                       pins = "GPIO0";
>> +                       function = "ldo";
>> +               };
>> +
>> +               /omit-if-no-ref/
>> +               gpio1_ldo: gpio1-ldo-pin {
>> +                       pins = "GPIO1";
>> +                       function = "ldo";
>> +               };
>> +       };
>> +
> 
> We have
> 
>     reg_ldo_io0: ldo-io0 {
>             pinctrl-names = "default";
>             pinctrl-0 = <&gpio0_ldo>;
>             /* Disable by default to avoid conflicts with GPIO */
>             ...
>     }
> 
> in axp81x.dtsi . Should we add it here and for axp803.dtsi as well?

Actually, I don't think these pinctrl nodes should exist at all. The
regulator already sets the pinmux, because that is the only way to turn
the regulator on/off. So I think we should leave it alone here.

Regards,
Samuel

> Otherwise,
> 
> Reviewed-by: Chen-Yu Tsai <wens@...e.org>