linux-kernel - Re: [PATCH v5 07/12] arm64: dts: mediatek: set vmc regulator as always on

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Message-ID: <b7a43215-8c51-8609-63bb-c0748887688a@baylibre.com>
Date:   Tue, 11 Apr 2023 13:17:21 +0200
From:   Alexandre Mergnat <amergnat@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        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>
Cc:     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 v5 07/12] arm64: dts: mediatek: set vmc regulator as
 always on


On 11/04/2023 10:23, AngeloGioacchino Del Regno wrote:
> Il 07/04/23 14:59, amergnat@...libre.com ha scritto:
>> From: Fabien Parent <fparent@...libre.com>
>>
>> MSDC1 IP block is powered by VMC. Make sure it is always on.
>>
>
> Can't we set vmc as parent of vemc? 

I don't find parent property for regulators. AFAIK, vin-supply is used in other DTS to do that but is it supported by fixed-regulator and gpio-regulator, which is not the case here.
Based on this, I don't think so, but I'm probably missing something.

Regards,
Alexandre