linux-kernel - Re: [PATCH 1/4] regulator: core: Support trying to get close to a certain voltage

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Date:	Fri, 12 Dec 2014 00:24:10 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Alexandru Stan <amstan@...omium.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] regulator: core: Support trying to get close to a
 certain voltage

On Thu, Dec 11, 2014 at 11:55:55AM -0800, Doug Anderson wrote:
> On Thu, Dec 11, 2014 at 9:09 AM, Mark Brown <broonie@...nel.org> wrote:

> > Please also bear in mind the need to handle shared supplies in your
> > implementation.

> I'm being dense, can you give more details?  Do you want me to grab
> the mutex or do something smarter like track the voltage / tolerance
> requested by multiple clients and resolve them, or ...?

I mean the latter - what happens if more than one consumer is trying to
use the regulator?  This is IIRC why _set_voltage_tol() uses the cheap
and nasty implementation it does.  There's also the potential
performance considerations for the DVS type applications now I think
about it.

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