linux-kernel - Re: [PATCH v3 1/2] regulator: dt-bindings: add QCOM RPMh regulator bindings

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Message-ID: <20180530093701.GD6920@sirena.org.uk>
Date:   Wed, 30 May 2018 10:37:01 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     David Collins <collinsd@...eaurora.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v3 1/2] regulator: dt-bindings: add QCOM RPMh regulator
 bindings

On Tue, May 29, 2018 at 10:30:33PM -0700, Doug Anderson wrote:
> On Wed, May 23, 2018 at 8:56 AM, Mark Brown <broonie@...nel.org> wrote:

> > Yes, that's definitely not what's expected but it's unfortunately what
> > the firmware chose to implement so we may well be stuck with it
> > unfortunately.

> We're not really stuck with it if we do what I was suggesting.  I was
> suggesting that every time we disable the regulator in Linux we have
> Linux vote for the lowest voltage it's comfortable with.  Linux keeps
> track of the true voltage that the driver wants and will always change
> its vote back to that before enabling.  Thus (assuming Linux is OK
> with 1.2 V - 1.4 V for a rail):

That's pretty much what it should do anyway with normally designed
hardware.

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