linux-kernel - Re: [RFC,PATCH 1/2] Add a common struct clk

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Date:	Fri, 11 Jun 2010 18:50:30 +0800
From:	Jeremy Kerr <jeremy.kerr@...onical.com>
To:	Lothar Waßmann <LW@...o-electronics.de>
Cc:	"Uwe Kleine-König" 
	<u.kleine-koenig@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	Ben Herrenchmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, Ben Dooks <ben-linux@...ff.org>
Subject: Re: [RFC,PATCH 1/2] Add a common struct clk

Hi Lothar,

> You may want to disable a clock in the IRQ handler. The VPU driver in
> the Freescale BSP for i.MX51 does exactly this.

Is this something we can defer to a sleepable context?

> Anyway I don't see any reason for using a mutex here instead of
> spin_lock_irq_save() as all other implementations do.

Just that enable/disable may take an arbitrarily long time to complete. Sounds 
like that hasn't been a problem in the past though.

Cheers,


Jeremy
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