linux-kernel - Re: [PATCH v3] clock: max77686: Add driver for Maxim 77686 32KHz crystal oscillator

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Message-ID: <20120611111624.GJ11439@opensource.wolfsonmicro.com>
Date:	Mon, 11 Jun 2012 19:16:25 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Jonghwa Lee <jonghwa3.lee@...sung.com>
Cc:	linux-kernel@...r.kernel.org,
	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Hartley Sweeten <hsweeten@...ionengravers.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH v3] clock: max77686: Add driver for Maxim 77686 32KHz
 crystal oscillator

On Mon, Jun 11, 2012 at 08:01:20PM +0900, Jonghwa Lee wrote:

> v3
>  - Add mutex to the max77686_clk structure to make atomic execution of enable/disable function.

No, you've not understood the issue.  As I said on my previous review
these need to be prepare() and unprepare() since enable() and disable()
execute in atomic context - that means you can't do I2C I/O and you
can't take mutexes.

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