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

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Message-Id: <32E780BE-58B7-4303-AA49-1852C4C7EB50@kernel.crashing.org>
Date:	Fri, 18 May 2007 11:31:19 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Thomas Gleixner <tglx@...utronix.de>
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 May 18, 2007, at 9:48 AM, Thomas Gleixner wrote:

> On Fri, 2007-05-18 at 15:28 +0100, Matt Sealey wrote:
>>>> I guess the real question is, how high resolution does a high  
>>>> resolution
>>>> timer need to be,
>>>
>>>    In the order of microseconds.
>>
>> I think both the MPC52xx GPT0-7 and the SLT0-1 fulfil this fairly
>> easily.
>
> There is some basic work for MPC5200 available:
>
> http://www.pengutronix.de/oselas/bsp/phytec/index_en.html#phyCORE- 
> MPC5200B-tiny

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.

- k
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