linux-kernel - Re: Applied "regulator: pbias: Select voltage table based on max-voltage" to the regulator tree

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Message-ID: <20170904164809.5coe6vhgyc7iwy6q@sirena.org.uk>
Date:   Mon, 4 Sep 2017 17:48:09 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Ravikumar Kattekola <rk@...com>, Sekhar Nori <nsekhar@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tony Lindgren <tony@...mide.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Applied "regulator: pbias: Select voltage table based on
 max-voltage" to the regulator tree

On Mon, Sep 04, 2017 at 11:16:54AM +0530, Kishon Vijay Abraham I wrote:
> On Friday 01 September 2017 09:53 PM, Mark Brown wrote:

> > Hang on, how can this break anything?  If it breaks things shouldn't
> > there be bugfixes for incorrect constraints somewhere?

> omap_hsmmc sets the pbias voltage to 3V. But here we program the volt table to
> support either 1.8V or 3.3V (Initially the volt table was programmed to support
> 3V because of a bug in TRM). So set_voltage of pbias voltage in omap_hsmmc will
> fail.

Oh, that's appauling.  I guess this is some voltage that doesn't get
presented to cards because otherwise I'm surprised nobody noticed.
Anyway I've dropped the commit from my pull request for now, it'll not
go for v4.14, but the pull request is still there.

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