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

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Message-ID: <20180530150241.GO6920@sirena.org.uk>
Date:   Wed, 30 May 2018 16:02:41 +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 Wed, May 30, 2018 at 07:46:50AM -0700, Doug Anderson wrote:
> On Wed, May 30, 2018 at 2:37 AM, Mark Brown <broonie@...nel.org> wrote:

> >> 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.

> I guess the question is: do we insist that the driver include this
> workaround, or are we OK with letting the hardware behave as the
> hardware does?

What you're describing sounds like what we should be doing normally, if
we're not doing that we should probably be fixing the core.

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