phc2sys -s /dev/ptp0 -c CLOCK_REALTIME -O 0 -m
phc2sys[2261.306]: CLOCK_REALTIME phc offset -1776861780942353868 s0 freq      +0 delay      0
phc2sys[2262.310]: CLOCK_REALTIME phc offset -1776861781946877648 s0 freq      +0 delay      0
phc2sys[2263.316]: CLOCK_REALTIME phc offset -1776861782952480288 s0 freq      +0 delay      0
phc2sys[2264.319]: CLOCK_REALTIME phc offset -1776861783955260208 s0 freq      +0 delay      0
phc2sys[2265.320]: CLOCK_REALTIME phc offset -1776861784956647540 s0 freq      +0 delay      0
phc2sys[2266.326]: CLOCK_REALTIME phc offset -1776861785962228478 s0 freq      +0 delay      0
phc2sys[2267.329]: CLOCK_REALTIME phc offset -1776861786965275128 s0 freq      +0 delay      0
phc2sys[2268.330]: CLOCK_REALTIME phc offset -1776861787966541401 s0 freq      +0 delay      0
phc2sys[2269.336]: CLOCK_REALTIME phc offset -1776861788972212051 s0 freq      +0 delay      0
phc2sys[2270.339]: CLOCK_REALTIME phc offset -1776861789975282261 s0 freq      +0 delay      0