linux-kernel - Re: [PATCH] clocksource: clocksource/clockevent driver for Synopsys dw_apb

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Message-ID: <20110331095051.7933c7b9@jacob-laptop>
Date:	Thu, 31 Mar 2011 09:50:51 -0700
From:	jacob pan <jacob.jun.pan@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jamie Iles <jamie@...ieiles.com>,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] clocksource: clocksource/clockevent driver for Synopsys
 dw_apb_timer

On Thu, 31 Mar 2011 17:33:12 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Thu, 31 Mar 2011, Jamie Iles wrote:
> 
> > This patch adds a driver for the Synopsys DesignWare APB timer block
> > found in some ARM systems.  This uses the timers with an IRQ as a
> > clockevents device and a timer without an IRQ as a clocksource
> > device.
> 
> Interesting. That's probably the same thing as:
> 
>      arch/x86/kernel/apb_timer.c
> 
> So if we merge that thing, then we should make sure, that we can
> replace the x86 one with it.
> 
It seems we have room to consolidate, here is my 2c:
1. need to support multiple timer channels
2. support percpu clockevent, need to deal with cpu online/offline
3. early boot needs. I don't know if abp timer is needed for booting on
ARM platforms. But for Moorestown, we need timer before platform bus
running. So I guess we cannot enumerate the timer as platform device.

-- 
Thanks

Jacob

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