linux-kernel - Re: [RFC PATCH 0/2] cpufreq/regulator: Limit minimum voltage only

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Message-ID: <20130422132549.GM30351@opensource.wolfsonmicro.com>
Date:	Mon, 22 Apr 2013 14:25:49 +0100
From:	Mark Brown <broonie@...nel.org>
To:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
Cc:	"Kondratiuk, Taras" <taras@...com>, "Menon, Nishanth" <nm@...com>,
	"Mohammed, Afzal" <afzal@...com>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"rjw@...k.pl" <rjw@...k.pl>,
	"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Strashko, Grygorii" <grygorii.strashko@...com>,
	"Tseglytskyi, Andrii" <andrii.tseglytskyi@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"AnilKumar, Chimata" <anilkumar@...com>
Subject: Re: [RFC PATCH 0/2] cpufreq/regulator: Limit minimum voltage only

On Mon, Apr 22, 2013 at 06:11:12AM +0000, Bedia, Vaibhav wrote:
> On Sat, Apr 20, 2013 at 05:54:10, Kondratiuk, Taras wrote:

> that the PMIC outputs can come is either 1.25V or 1.275V. Now i think there's
> been some confusion in the implementation phase due to things like board level
> IR drops and variations mentioned in the PMIC datasheets which has resulted in
> the tolerance being used both in am33xx.dtsi and then again in the cpufreq driver.

Note that there is support in the regulator API for putting information
in about voltage drops from the board to help compensate for things like
this.  It's just a straight linear offset but it should be OK for most
uses.

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