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Message-ID: <alpine.LFD.2.00.1103311859230.22418@localhost6.localdomain6>
Date: Thu, 31 Mar 2011 19:00:27 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: jacob pan <jacob.jun.pan@...ux.intel.com>
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, jacob pan wrote:
> 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.
That's a solvable problem. I just don't want to see two incarnations
of the same thing in the kernel. Can you folks hash that out together
what it needs to work everywhere please ?
Thanks,
tglx
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