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From:   Alexandre Mergnat <amergnat@baylibre.com>
Date:   Fri, 31 Mar 2023 13:23:32 +0200
Message-ID: <CAFGrd9oYMXgWVxQHfn6hT0chx6kg+4UhP4Q=v4f+gF_NahhNdA@mail.gmail.com>
Subject: Re: [PATCH v3 10/17] arm64: dts: mediatek: set vmc regulator as
 always on
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Cc:     Wim Van Sebroeck <wim@linux-watchdog.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Chaotian Jing <chaotian.jing@mediatek.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Wenbin Mei <wenbin.mei@mediatek.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Zhiyong Tao <zhiyong.tao@mediatek.com>,
        =?UTF-8?Q?Bernhard_Rosenkr=C3=A4nzer?= <bero@baylibre.com>,
        linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-mmc@vger.kernel.org,
        linux-gpio@vger.kernel.org,
        Alexandre Bailon <abailon@baylibre.com>,
        Fabien Parent <fparent@baylibre.com>,
        Amjad Ouled-Ameur <aouledameur@baylibre.com>
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Le ven. 31 mars 2023 =C3=A0 13:08, Alexandre Mergnat
<amergnat@baylibre.com> a =C3=A9crit :
>
> Le mer. 29 mars 2023 =C3=A0 15:25, AngeloGioacchino Del Regno
> <angelogioacchino.delregno@collabora.com> a =C3=A9crit :
> >
> > Il 29/03/23 10:54, amergnat@baylibre.com ha scritto:
> > > From: Fabien Parent <fparent@baylibre.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 =3D <&mt6357_vmc_reg>;
> };

Additionally, vin-supply is supported by fixed-regulator and
gpio-regulator, which is not the case here.
I think it isn't doable.

Regards,
Alex