linux-kernel - Re: Meaning of clk_round

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Message-ID: <4C3EAA44.7040607@codeaurora.org>
Date:	Wed, 14 Jul 2010 23:27:16 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org, David Brownell <david-b@...bell.net>
Subject: Re: Meaning of clk_round_rate()?

Russell King - ARM Linux wrote:
> On Wed, Jul 14, 2010 at 11:05:46AM -0700, Stephen Boyd wrote:
> clk_round_rate() returns the clock rate which will be set if you ask
> clk_set_rate() to set that rate.  It provides a way to query from
> the implementation exactly what rate you'll get if you use clk_set_rate()
> with that same argument.

Fair enough explanation for clk_round_rate(). I guess I should take it 
as "it's up to the specific clock implementation on what it wants to do".

But what about the problem of a clock consumer trying to find a suitable 
frequency amongst the ones provided by a particular clock?

What are your thoughts on adding the following two APIs to linux/clk.h?
clk_round_rate_down/floor()
clk_round_rate_up/ceil()

Thanks,
Saravana

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