From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Cochran Subject: Re: PTP_PEROUT_REQUEST and clock stepping Date: Fri, 12 Sep 2014 08:33:10 +0200 Message-ID: <20140912063310.GA6198@netboy> References: <54107965.6040007@emlix.com> <20140910172619.GB5944@localhost.localdomain> <20140911095245.GA5823@emlix.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Daniel =?iso-8859-1?Q?Gl=F6ckner?= , "netdev@vger.kernel.org" To: Christian Riesch Return-path: Received: from mail-we0-f178.google.com ([74.125.82.178]:38670 "EHLO mail-we0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751721AbaILGdP (ORCPT ); Fri, 12 Sep 2014 02:33:15 -0400 Received: by mail-we0-f178.google.com with SMTP id q58so236121wes.37 for ; Thu, 11 Sep 2014 23:33:14 -0700 (PDT) Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On Fri, Sep 12, 2014 at 08:24:49AM +0200, Christian Riesch wrote: > On Thu, Sep 11, 2014 at 11:52 AM, Daniel Gl=F6ckner wr= ote: > > Only a small fraction of people > > using periodic outputs will want to schedule the start of the signa= l at > > a specific time in the future and only a fraction of those will use= a > > .period value that is so small that they can't use a timer to confi= gure > > the periodic output within .period/2 before the desired start time. >=20 > Ok, I got it now. So you are suggesting to change the behavior of > PTP_PEROUT_REQUEST, aren't you? And break existing applications? > Christian I think he wants the periodic output to continue at the same phase and frequency, even when you reset the clock time. However, this is impossible to acheive because the hardware does not support it. Thanks, Richard