The -p option for ptp4l, which specifies the PHC device, was added before the ethtool get_ts_info ioctl had been invented. Today it does not "force" the given device as the man page says. Instead this is a legacy option only useful when running on older kernels.
Signed-off-by: Richard Cochran <richardcoch...@gmail.com> --- ptp4l.8 | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/ptp4l.8 b/ptp4l.8 index 0ab2e23..72baf86 100644 --- a/ptp4l.8 +++ b/ptp4l.8 @@ -1,4 +1,4 @@ -.TH PTP4l 8 "December 2014" "linuxptp" +.TH PTP4l 8 "July 2016" "linuxptp" .SH NAME ptp4l - PTP Boundary/Ordinary Clock @@ -70,8 +70,10 @@ Specify a PTP port, it may be used multiple times. At least one port must be specified by this option or in the configuration file. .TP .BI \-p " phc-device" -With hardware time stamping, force which PHC device (e.g. /dev/ptp0) should be -used. +(This option is deprecated.) +Before Linux kernel v3.5 there was no way to discover the PHC device +associated with a network interface. This option specifies the PHC +device (e.g. /dev/ptp0) to be used when running on legacy kernels. .TP .B \-s Enable the slaveOnly mode. -- 2.1.4 ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
