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

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Message-Id: <20150709.150110.1865960968554925450.davem@davemloft.net>
Date:	Thu, 09 Jul 2015 15:01:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	christopher.s.hall@...el.com
Cc:	richardcochran@...il.com, 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

From: Christopher Hall <christopher.s.hall@...el.com>
Date: Wed,  8 Jul 2015 13:46:41 -0700

> 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.

Please resubmit this once there is an actual user of this new
facility, not beforehand.

Thank you.
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