linux-kernel - Re: [RFC PATCH 2/5] clk: Introduce 'clk_round_rate

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Message-ID: <9956935.0oj56vcaUh@vostro.rjw.lan>
Date:	Mon, 26 May 2014 13:47:44 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Mike Turquette <mturquette@...aro.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Michal Simek <michal.simek@...inx.com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 2/5] clk: Introduce 'clk_round_rate_nearest()'

On Monday, May 26, 2014 04:37:13 PM Viresh Kumar wrote:
> On 26 May 2014 16:52, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> > I agree as far as the 64-bit thing goes, but is switching to Hz really
> > necessary?
> 
> Don't really know that.. It seems that there will always be problems with
> close enough frequencies whenever rounding is done.

Well, rounding errors are a problem, but question is if that is enough of
a problem to justify expanding the storage size twice.  Also, that'd be
a performance hit on 32-bit systems.

> More can be elaborated by Soren.

OK

Rafael

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