linux-kernel - Re: [PATCH 1/1] cpufreq: cpufreq-cpu0: use the max voltage instead of voltage-tolerance

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Date:	Thu, 7 Nov 2013 12:55:42 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Rongjun Ying <Rongjun.Ying@....com>
CC:	Viresh Kumar <viresh.kumar@...aro.org>, rjying <rjying@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Barry Song <Barry.Song@....com>
Subject: Re: [PATCH 1/1] cpufreq: cpufreq-cpu0: use the max voltage instead
 of voltage-tolerance

On Thu, Nov 07, 2013 at 03:32:09AM +0000, Rongjun Ying wrote:
> I think my patch is better.

Well, unfortunately your patch is plainly wrong, because there are
in-tree users of voltage-tolerance right now.  How can you simply remove
it from driver with ignoring these users?

$ git grep voltage-tolerance arch/arm/boot/dts
arch/arm/boot/dts/am33xx.dtsi:                  voltage-tolerance = <2>; /* 2 percentage */
arch/arm/boot/dts/imx27.dtsi:                   voltage-tolerance = <5>;
arch/arm/boot/dts/r8a73a4-ape6evm-reference.dts:        voltage-tolerance = <1>; /* 1% */
arch/arm/boot/dts/r8a73a4-ape6evm.dts:  voltage-tolerance = <1>; /* 1% */
arch/arm/boot/dts/sh73a0-kzm9g-reference.dts:                   voltage-tolerance = <1>; /* 1% */

Shawn

> All soc have a max work voltage. If regulator IC can't supply min voltage, 
> It can supply max voltage to soc.
> As my patch, not need overwrite OPP in <board>.dts.
> As your comment above, almost all board need overwrite OPP, unless the regulator 
> IC can supply all voltage ranges of SoC need.

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