From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: [PATCH 6/8] ptp: Added a clock that uses the eTSEC found on the MPC85xx. Date: Thu, 23 Sep 2010 21:43:59 +0100 Message-ID: <20100923214359.3f287b11@lxorguk.ukuu.org.uk> References: <57b64051c816dc9cb856bbb9f38fc901c9d3d651.1285261535.git.richard.cochran@omicron.at> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Christoph Lameter Cc: Richard Cochran , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Arnd Bergmann , David Miller , John Stultz , Krzysztof Halasa , Peter Zijlstra , Rodolfo Giometti , Thomas Gleixner List-Id: devicetree@vger.kernel.org > Please do not introduce useless additional layers for clock sync. Load > these ptp clocks like the other regular clock modules and make them sync > system time like any other clock. I don't think you understand PTP. PTP has masters, a system can need to be honouring multiple conflicting masters at once. > Really guys: I want a PTP solution! Now! And not some idiotic additional > kernel layers that just pass bits around because its so much fun and > screws up clock accurary in due to the latency noise introduced while > having so much fun with the bits. There are some interesting complications in putting a PTP sync interface in kernel.