linux-kernel - Re: [PATCH v3 10/17] arm64: dts: mediatek: set vmc regulator as always on

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Message-ID: <CAFGrd9qMEtHVT+P-mBNxh6g1jOm5ifArSxi1bbGnrKgxCf7zSQ@mail.gmail.com>
Date:   Fri, 31 Mar 2023 13:08:43 +0200
From:   Alexandre Mergnat <amergnat@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Wenbin Mei <wenbin.mei@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Zhiyong Tao <zhiyong.tao@...iatek.com>,
        Bernhard Rosenkränzer <bero@...libre.com>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        Alexandre Bailon <abailon@...libre.com>,
        Fabien Parent <fparent@...libre.com>,
        Amjad Ouled-Ameur <aouledameur@...libre.com>
Subject: Re: [PATCH v3 10/17] arm64: dts: mediatek: set vmc regulator as
 always on

Le mer. 29 mars 2023 à 15:25, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> a écrit :
>
> Il 29/03/23 10:54, amergnat@...libre.com ha scritto:
> > From: Fabien Parent <fparent@...libre.com>
> >
> > MSDC1 IP block is powered by VMC. Make sure it is always on.
>
> Why always on?
> Can't you just set mt6357_vmc_reg as VIN of mt6357_vmch_reg? :-)

I'm not sure to get it. mt6357_vmc_reg & mt6357_vmch_reg come from
PMIC and are supposed to be independent.
You suggest to link them in the mt8365-evk dts file using something like:
&mt6357_vmch_reg {
    vin-supply = <&mt6357_vmc_reg>;
};

Also, regulator binding probably needs change to support that.

Regards,
Alex