linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Date:	Fri, 18 May 2007 18:50:59 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Matt Sealey <matt@...esi-usa.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	linuxppc-dev@...abs.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org,
	Robert Schwebel <r.schwebel@...gutronix.de>
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

On Fri, 2007-05-18 at 11:31 -0500, Kumar Gala wrote:
> I asked this earlier, but figured you might have a better insight.   
> Is their value in having 'drivers' for more than one clock source?   
> I'd say most (of not all) the PPC SoCs have timers on the system side  
> that we could provide drivers for, I'm just not sure if that does  
> anything for anyone.

Not necessarily for the tick/highres stuff, but clock events allows
other users as well to utilize such facilities. We have no users yet,
but there are drivers, which utilize special timer hardware with nice
#ifdeffery to allow the driver to be shared. This might be a useful
thing for such stuff.

	tglx


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