linux-kernel - Re: [PATCH 2/2] clk: Generic support for fixed-rate clocks

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Message-Id: <201102220729.13708.jeremy.kerr@canonical.com>
Date:	Tue, 22 Feb 2011 07:29:11 +0800
From:	Jeremy Kerr <jeremy.kerr@...onical.com>
To:	Ryan Mallon <ryan@...ewatersys.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Dima Zavin <dmitriyz@...gle.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-sh@...r.kernel.org,
	Ben Herrenchmidt <benh@...nel.crashing.org>,
	"Uwe Kleine-König" 
	<u.kleine-koenig@...gutronix.de>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Paul Mundt <lethal@...ux-sh.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH 2/2] clk: Generic support for fixed-rate clocks

Hi Ryan,

> If we never need to dynamically create fixed clocks (which seems
> unlikely) then rate can be const.

There's been a few cases where I've needed to set the rate of a fixed clock 
during boot - for example when a clock rate varies between boards, it may be 
defined in a platform-wide file, but have the rate modified early (ie, 
clk_foo.rate = 32678) in a board file.

Also, if we're parsing clocks from the device tree (or any other discovery 
mechanism), we'll need to modify rate.

Cheers,


Jeremy
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