linux-kernel - Re: [PATCH] regulator: core: Skip balancing of the enabled regulators in regulator

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Message-ID: <20191008171747.GS4382@sirena.co.uk>
Date:   Tue, 8 Oct 2019 18:17:47 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Kamil Konieczny <k.konieczny@...sung.com>
Subject: Re: [PATCH] regulator: core: Skip balancing of the enabled
 regulators in regulator_enable()

On Tue, Oct 08, 2019 at 08:05:03PM +0300, Dmitry Osipenko wrote:
> 08.10.2019 19:15, Mark Brown пишет:

> > That sounds like it might just postpone the inevitable - if you set the
> > wrong voltage first it might decide to drop down some voltage that
> > wasn't expected.  There's a bit of a bootstrapping issue.  I think it
> > would be safer to just say that anything that is within spec won't get
> > changed any time we balance, we'd only change things if needed to bring
> > them back into spec.

> Yes, the case of changing voltage before regulator is enabled seems
> won't work as expected.

> Maybe it won't hurt to disallow a non always-on regulators to be coupled
> until there will be a real user for that case.

I thought that coupling with the CPU core and main SoC power regulators
was one of the main use cases for this feature?

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