From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030455AbXAHCba (ORCPT ); Sun, 7 Jan 2007 21:31:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030453AbXAHCba (ORCPT ); Sun, 7 Jan 2007 21:31:30 -0500 Received: from smtp101.sbc.mail.mud.yahoo.com ([68.142.198.200]:46696 "HELO smtp101.sbc.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1030455AbXAHCb3 (ORCPT ); Sun, 7 Jan 2007 21:31:29 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=pacbell.net; h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=pM4+1oZRz8ZEa+RnPIikXRxc4yf5UhigmczS8KICw8uMldxqabtXBIdQH7W1WteHkQF48eWRfAu9MBc0RwTjjXribQGy+OWULdNLGkJ5MujUvEOI0Lk+K9GTqdTLyZB9hE+1w9ScflAANgWlEI2jKkIdLt+pVBsYKb2SNC5RWak= ; X-YMail-OSG: J0idOdAVM1ksGIGuaToQGL9IzSM1mx9U4kjGgX1tDm1HpOhePDlPR75sVBqXS0DZyNl4sSo0eer.UfXI8f6aNBbS49mIyMyzjgrLQjP1QEhSyVTvOpA8dQ.Fy63DJmEmFBdE8Vvk3hPfR1iKLgs7e7O9KquypiWJU.SAl6_vFP9R.cfSjofTqDaURgpj From: David Brownell To: Philippe De Muyter Subject: Re: RTC subsystem and fractions of seconds Date: Sun, 7 Jan 2007 18:10:30 -0800 User-Agent: KMail/1.7.1 Cc: Linux Kernel list , Alessandro Zummo References: <200701051949.00662.david-b@pacbell.net> <20070107101449.GA24163@ingate.macqel.be> In-Reply-To: <20070107101449.GA24163@ingate.macqel.be> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200701071810.30310.david-b@pacbell.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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