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

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Message-ID: <4D5A063F.1010102@codeaurora.org>
Date:	Mon, 14 Feb 2011 20:51:11 -0800
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	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>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Ryan Mallon <ryan@...ewatersys.com>,
	Dima Zavin <dmitriyz@...gle.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [RFC,PATCH 2/3] clk: Generic support for fixed-rate clocks

On 02/14/2011 05:41 PM, Jeremy Kerr wrote:
> Hi Ryan,
>
>> A fixed clock may still have other operations such as enable/disable.
>
> Then it's not a fixed clock; I'd prefer this to be a separate type, as it's
> now hardware dependent.
>

I'm confused. If a clock's rate can't be changed and it can't be enabled 
or disabled, then what's the point of representing that clock 
signal/line as a clock in the driver. Seems like a "nothing to see here, 
move along" type of clock. To express it differently, I find this 
similar to "if (1) { ... }". Obviously I'm missing something here. What 
is it?

-Saravana

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