linux-kernel - Re: [PATCH v5 7/7] Documentation:cpufreq:boost: Update BOOST documentation

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Message-id: <20130716133319.49ed0838@amdc308.digital.local>
Date:	Tue, 16 Jul 2013 13:33:19 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>, l.majewski@...ess.pl,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andre Przywara <andre.przywara@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>
Subject: Re: [PATCH v5 7/7] Documentation:cpufreq:boost: Update BOOST
 documentation

On Tue, 16 Jul 2013 15:31:43 +0530 Viresh Kumar viresh.kumar@...aro.org
wrote,
> On 4 July 2013 14:20, Lukasz Majewski <l.majewski@...sung.com> wrote:
> > -Reading the file is always supported, even if the processor does
> > not -support boosting. In this case the file will be read-only and
> > always -reads as "0". Explicitly changing the permissions and
> > writing to that -file anyway will return EINVAL.
> > +The file is exported only when cpufreq driver supports boosting.
> > +Explicitly changing the permissions and writing to that file
> > anyway will +return EINVAL.
> 
> For acpi-cpufreq reading the file should be always supported. And this
> must be mentioned in doc.

As fair as I've understood our previous discussion (at [*]) we have
agreed about this. We only export boost attribute when it is supported
by cpufreq_driver. Rafael was very clear about exporting boost
attribute:

"Simple: Export it only when supported."

[*]: Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core
-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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