linux-kernel - Re: [PATCH 1/3] PM / OPP: Add support for descending order for cpufreq table

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Date:	Mon, 5 May 2014 19:44:48 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Nishanth Menon <nm@...com>
Cc:	Jonghwan Choi <jhbird.choi@...sung.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>
Subject: Re: [PATCH 1/3] PM / OPP: Add support for descending order for
 cpufreq table

On 5 May 2014 19:08, Nishanth Menon <nm@...com> wrote:
> With the brief history of the patch in linux-pm, I am unable to
> understand why not just use ceil/floor routines to pick up data the
> way you need it. It should not matter if we use an ordered list, or
> some other weird organization inside the storage. There are already
> accessors functions meant to precisely help with the case that is
> being tried here.

To be precise, for exynos they need the position of a frequency when
it is arranged in descending order. And they will simply write this position
in their clock controller later. For example, if frequencies are:
100 MHz, 200, 300, 400, 500, 600

Then they need to write 1 for 600, 2 for 500, 3 for 400, and so on..
I am not able to imaging how ceil/floor would help here.
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