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

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Date:	Tue, 03 Mar 2009 12:01:32 -0800
From:	john stultz <johnstul@...ibm.com>
To:	Dimitri Sivanich <sivanich@....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, 2009-03-03 at 09:22 -0600, Dimitri Sivanich wrote:
> This patch provides a driver for SGI RTC clocks and timers.
> 
> This provides a high resolution clock and timer source using the SGI
> system-wide synchronized RTC clock/timer hardware.
> 
> Signed-off-by: Dimitri Sivanich <sivanich@....com>
> 
> ---
> 
> Implemented suggested changes and refreshed for latest -tip.
> 
>  drivers/clocksource/Makefile |    1 
>  drivers/clocksource/rtc_uv.c |  381 +++++++++++++++++++++++++++++++++++++++
>  drivers/misc/Kconfig         |    9 
>  3 files changed, 391 insertions(+)
[snip]
> +
> +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.

thanks
-john


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