Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754965Ab3IJHbY (ORCPT ); Tue, 10 Sep 2013 03:31:24 -0400 Received: from ip-196-116.sn1.eutelia.it ([62.94.196.116]:14031 "EHLO goldrake.enneenne.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754316Ab3IJHbW (ORCPT ); Tue, 10 Sep 2013 03:31:22 -0400 Date: Tue, 10 Sep 2013 09:31:05 +0200 From: Rodolfo Giometti To: Paul Chavent Cc: linux-usb@vger.kernel.org, gregkh@linuxfoundation.org, jhovold@gmail.com, fschaefer.oss@googlemail.com, jslaby@suse.cz, max@suse.de, linux-kernel@vger.kernel.org Message-ID: <20130910073105.GB5030@enneenne.com> Mail-Followup-To: Paul Chavent , linux-usb@vger.kernel.org, gregkh@linuxfoundation.org, jhovold@gmail.com, fschaefer.oss@googlemail.com, jslaby@suse.cz, max@suse.de, linux-kernel@vger.kernel.org References: <1378742480-2146-1-git-send-email-paul.chavent@onera.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1378742480-2146-1-git-send-email-paul.chavent@onera.fr> Organization: GNU/Linux Device Drivers, Embedded Systems and Courses X-PGP-Key: gpg --keyserver keyserver.linux.it --recv-keys D25A5633 User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: 192.168.32.10 X-SA-Exim-Mail-From: giometti@enneenne.com Subject: Re: [PATCH 0/5] Enable PPS reporting for USB serial devices X-SA-Exim-Version: 4.2.1 (built Mon, 22 Mar 2010 06:51:10 +0000) X-SA-Exim-Scanned: Yes (on goldrake.enneenne.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1016 Lines: 27 On Mon, Sep 09, 2013 at 06:01:15PM +0200, Paul Chavent wrote: > Hi. > > This series enable the PPS reporting for USB serial devices. I have nothing against with this solution but consider that reporting a PPS signal through USB bus may add unknown delays that may vanish clock stability... as far as I know you should not use USB serial port with PPS. Have you some statistics about clock stability in a real implementation? 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 Freelance ICT Italia - Consulente ICT Italia - www.consulenti-ict.it -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/