linux-kernel - Re: [PATCH 6/6 v6] SGI RTC: add clocksource driver

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Date:	Tue, 3 Mar 2009 14:25:06 -0600
From:	Dimitri Sivanich <sivanich@....com>
To:	john stultz <johnstul@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6 v6] SGI RTC: add clocksource driver

On Tue, Mar 03, 2009 at 12:01:32PM -0800, john stultz wrote:
> On Tue, 2009-03-03 at 09:22 -0600, Dimitri Sivanich wrote:
> > +
> > +static struct clocksource clocksource_uv = {
> > +	.name		= RTC_NAME,
> > +	.rating		= 400,
> > +	.read		= uv_read_rtc,
> > +	.mask		= (cycle_t)UVH_RTC_REAL_TIME_CLOCK_MASK,
> > +	.shift		= 10,
> 
> 
> What is the expected value for sn_rtc_cycles_per_second ? 
> 
> I ask because a shift value of 10 seems a bit low. It could very well be
> appropriate, but I just wanted to check.
> 

Likely in the range of 20,000,000 - 40,000,000.
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