PTP_PTP_TOD_NSEC_PTP_TOD_NSEC
FIELD_PREP(PTP_PTP_TOD_NSEC_PTP_TOD_NSEC, x)
FIELD_GET(PTP_PTP_TOD_NSEC_PTP_TOD_NSEC, x)
ns &= PTP_PTP_TOD_NSEC_PTP_TOD_NSEC;