linux-kernel - Re: [PATCH v2 3/4] Add support for driver cross-timestamp to PTP_SYS

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Message-ID: <20150810085310.GB18566@localhost.localdomain>
Date:	Mon, 10 Aug 2015 10:53:10 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Christopher Hall <christopher.s.hall@...el.com>
Cc:	john.stultz@...aro.org, tglx@...utronix.de, mingo@...hat.com,
	jeffrey.t.kirsher@...el.com, john.ronciak@...el.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/4] Add support for driver cross-timestamp to
 PTP_SYS_OFFSET ioctl

On Fri, Aug 07, 2015 at 04:01:34PM -0700, Christopher Hall wrote:
> This patch allows system and device time ("cross-timestamp") to be
> performed by the driver. Currently, the cross-timestamping is performed
> in the PTP_SYS_OFFSET ioctl.  The PTP clock driver reads gettimeofday()
> and the gettime64() callback provided by the driver. The cross-timestamp
> is best effort where the latency between the capture of system time
> (getnstimeofday()) and the device time (driver callback) may be
> significant.

Acked-by: Richard Cochran <richardcochran@...il.com>
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