linux-kernel - Re: [PATCH v3 2/2] regulator: mt6360: Add DT binding documentation

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Message-ID: <20200825100804.GD5379@sirena.org.uk>
Date:   Tue, 25 Aug 2020 11:08:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Gene Chen <gene.chen.richtek@...il.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>, robh+dt@...nel.org,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Gene Chen <gene_chen@...htek.com>
Subject: Re: [PATCH v3 2/2] regulator: mt6360: Add DT binding documentation

On Tue, Aug 25, 2020 at 06:01:46PM +0800, Gene Chen wrote:
> Mark Brown <broonie@...nel.org> 於 2020年8月25日 週二 下午5:34寫道：

> > > LDO_VINx is HW design layout, so actually it can't be changed by device tree.
> > > LDO_VIN1/LDO_VIN2 supply from VSYS, not regulator, so I think usually
> > > not to show the supply from in device tree.
> > > or I should declare a dummy reference to system power like "*-supply =
> > > <&system_power>;"?

> > When you say it's from the hardware design do you mean it's fixed by the
> > silicon or is this something that's fixed in the board?

> fixed in the board, not silicon.

Ah, if it's fixed by the board that's exactly the sort of thing that
should be in DT - the DT describes the board so if some other system has
a different configuration then it will have a different DT.  With supply
properties you can just leave them missing in the DT, you're not
supposed to but so many systems do it that the framework will handle it.
Otherwise if you want to represent VSYS you can have a fixed voltage
regulator with no control and hook them up to it.

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