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Date:	Thu, 01 Nov 2012 11:42:50 -0400 (EDT)
From:	David Miller <>
Subject: Re: [PATCH V2 net-next 1/1] ptp: add an ioctl to compare PHC time
 with system time

From: Richard Cochran <>
Date: Wed, 31 Oct 2012 17:19:07 +0100

> This patch adds an ioctl for PTP Hardware Clock (PHC) devices that allows
> user space to measure the time offset between the PHC and the system
> clock. Rather than hard coding any kind of estimation algorithm into the
> kernel, this patch takes the more flexible approach of just delivering
> an array of raw clock readings. In that way, the user space clock servo
> may be adapted to new and different hardware clocks.
> Signed-off-by: Richard Cochran <>
> Acked-by: Jacob Keller <>

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