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@gmail.com>