linux-kernel - Re: [PATCH] regulator: core: Make regulator object reflect configured voltage

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Message-ID: <20140204181831.GP22609@sirena.org.uk>
Date:	Tue, 4 Feb 2014 18:18:31 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Bjorn Andersson <bjorn@...o.se>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] regulator: core: Make regulator object reflect
 configured voltage

On Tue, Feb 04, 2014 at 10:02:14AM -0800, Bjorn Andersson wrote:
> On Tue, Feb 4, 2014 at 3:05 AM, Mark Brown <broonie@...nel.org> wrote:

> > Why not do this at the time we apply the voltage?  That would seem to be
> > more robust, doing it in a separate place means that we might update one
> > bit of code and not the other or might change the execution path so that
> > one gets run and the other doesn't.

> I do share your concerns about having this logic mirrored here is
> risky, unfortunately the regulator object is created upon request from
> a consumer; so it is not available when regulator_register() calls
> set_machine_constraints().

Oh, hang on - that's what you mean by a regulator object...   I don't
think this fixes the problem you think it does.  What is the actual
problem you're trying to fix here?  The min_uV and max_uV on a consumer
struct are supposed to be the request from that consumer, they should
only be set if the consumer actually made a request for a voltage range.

> An alternative is to drop the conditional setting of
> REGULATOR_CHANGE_VOLTAGE from of_regulator.c and force the regulator
> drivers to set this flag explicitly; to avoid the difference in
> behavior depending on configuration.

Why would having each individual driver open code things help?

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