linux-kernel - Re: Locking in the clk API

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Message-ID: <1295652102.2148.314.camel@pasglop>
Date:	Sat, 22 Jan 2011 10:21:42 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Colin Cross <ccross@...gle.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Saravana Kannan <skannan@...eaurora.org>,
	linux-sh@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Dima Zavin <dmitriyz@...gle.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-K??nig <u.kleine-koenig@...gutronix.de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Locking in the clk API

On Fri, 2011-01-21 at 14:28 -0800, Colin Cross wrote:
> Clocks that have a voltage dependency, or depend on a clock that has a
> voltage dependency, are non-atomic, everything else is atomic.  PLLs
> are atomic because they lock very fast (300 uS or 1ms) 

Some could argue that this is still way too slow for atomic context :-)

Cheers,
Ben.

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