From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761410AbYDKQ7D (ORCPT ); Fri, 11 Apr 2008 12:59:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760740AbYDKQ6y (ORCPT ); Fri, 11 Apr 2008 12:58:54 -0400 Received: from 81-174-11-161.static.ngi.it ([81.174.11.161]:52163 "EHLO mail.enneenne.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760604AbYDKQ6x (ORCPT ); Fri, 11 Apr 2008 12:58:53 -0400 Date: Fri, 11 Apr 2008 18:58:36 +0200 From: Rodolfo Giometti To: Serge Belyshev Cc: Alan Cox , linux-kernel@vger.kernel.org, Andrew Morton , David Woodhouse , Dave Jones , Sam Ravnborg , Greg KH , Randy Dunlap , Kay Sievers Message-ID: <20080411165836.GY26777@enneenne.com> References: <1207851751-25703-2-git-send-email-giometti@linux.it> <1207851751-25703-3-git-send-email-giometti@linux.it> <1207851751-25703-4-git-send-email-giometti@linux.it> <1207851751-25703-5-git-send-email-giometti@linux.it> <1207851751-25703-6-git-send-email-giometti@linux.it> <20080410210918.3be98868@core> <20080411075515.GH26777@enneenne.com> <20080411092840.3cc4de67@core> <20080411084903.GK26777@enneenne.com> <87prsw78qs.fsf@depni.sinp.msu.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87prsw78qs.fsf@depni.sinp.msu.ru> Organization: GNU/Linux Device Drivers, Embedded Systems and Courses X-PGP-Key: gpg --keyserver keyserver.linux.it --recv-keys D25A5633 User-Agent: Mutt/1.5.16 (2007-06-11) X-SA-Exim-Connect-IP: 192.168.32.1 X-SA-Exim-Mail-From: giometti@enneenne.com Subject: Re: [PATCH 5/7] PPS: serial clients support. X-SA-Exim-Version: 4.2.1 (built Tue, 09 Jan 2007 17:23:22 +0000) X-SA-Exim-Scanned: Yes (on mail.enneenne.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 11, 2008 at 06:43:07PM +0400, Serge Belyshev wrote: > Rodolfo Giometti writes: > > > The problem is that deferencing the pps_event() call will cause severe > > problems to PPS accuracy... here you can find some considerations on > > this topic: > > > > http://ml.enneenne.com/pipermail/linuxpps/2008-April/001738.html > > > > What about adding precise timestamping to the lowest possible irq > handling level ( arch/*/entry*.S ) and then export that information > in a general way so it is useful for other applications? The problem is that at such level you cannot easily retrieve info about where your serial port is connected to and which PPS source you should manage... Ciao, Rodolfo -- GNU/Linux Solutions e-mail: giometti@enneenne.com Linux Device Driver giometti@linux.it Embedded Systems phone: +39 349 2432127 UNIX programming skype: rodolfo.giometti