netdev - Re: [PATCH v3] Add support for driver cross-timestamp to PTP_SYS

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Message-ID: <20150709145748.GC3243@netboy>
Date:	Thu, 9 Jul 2015 16:57:48 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Christopher Hall <christopher.s.hall@...el.com>
Cc:	tglx@...utronix.de, john.stultz@...aro.org, john.ronciak@...el.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3] Add support for driver cross-timestamp to
 PTP_SYS_OFFSET ioctl

On Wed, Jul 08, 2015 at 01:46:41PM -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.

The interface looks okay to me.  Now all we need is a user of it...

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