linux-kernel - Re: [PATCH 6/8] ptp: Added a clock that uses the eTSEC found on the MPC85xx.

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Date:	Thu, 23 Sep 2010 21:43:59 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-api@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	David Miller <davem@...emloft.net>,
	John Stultz <johnstul@...ibm.com>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 6/8] ptp: Added a clock that uses the eTSEC found on the
 MPC85xx.

> 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.
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