linux-kernel - Re: RTC subsystem and fractions of seconds

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Message-Id: <200701071810.30310.david-b@pacbell.net>
Date:	Sun, 7 Jan 2007 18:10:30 -0800
From:	David Brownell <david-b@...bell.net>
To:	Philippe De Muyter <phdm@...qel.be>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Alessandro Zummo <alessandro.zummo@...ertech.it>
Subject: Re: RTC subsystem and fractions of seconds

On Sunday 07 January 2007 2:14 am, Philippe De Muyter wrote:
> On Fri, Jan 05, 2007 at 07:49:00PM -0800, David Brownell wrote:
> > >  	Those rtc's actually have a 1/100th of second
> > > register.  Should the generic rtc interface not support that?
> > 
> > Are you implying a new userspace API, or just an in-kernel update?
> > 
> > Either way, that raises the question of what other features should
> > be included.  What sub-second precision?  Multiple alarms?  Ways
> > to manage output clocks?  Sub-HZ periodic alarms?
> 
> One usefull addition for my needs and with a m41t81 is the support of
> the calibration of the rtc.  However this can perhaps be hidden in the
> .set_mmss function.

Doesn't seem like an set_mmss() mechanism at all.  Some drivers give
sysfs access to an oscillator "trim" mechanism.  What tools do you
have which track how far off that crystal is?

- Dave
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