linux-kernel - Re: [RFC,PATCH 2/3] clk: Generic support for fixed-rate clocks

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Message-ID: <4D5A1DAF.5050302@codeaurora.org>
Date:	Mon, 14 Feb 2011 22:31:11 -0800
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
CC:	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 Herrenschmidt <benh@...nel.crashing.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-kernel@...r.kernel.org, Ryan Mallon <ryan@...ewatersys.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC,PATCH 2/3] clk: Generic support for fixed-rate clocks

On 02/14/2011 10:18 PM, Jeremy Kerr wrote:

> Because the drivers using this clock don't know that it's a fixed clock.
>
> For example, a uart needs to know the rate of its clock source, so that it can
> set its internal divisors to get a valid baud rate. The uart driver will query
> the input rate using clk_get_rate(). The driver still needs to call
> clk_enable/clk_prepare/etc, because on some systems it may have a switchable
> clock.

Thanks. Makes sense.

-Saravana
-- 
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