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root@ptp2server:/# dmesg | grep tty
[    0.195782] printk: console [tty0] enabled
[    1.375377] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    1.395456] 0000:00:03.3: ttyS1 at I/O 0xecd8 (irq = 17, base_baud = 115200) is a 16550A

[Unit]
Description=Synchronize PTP hardware clock from external timestamp
# -s generic uses system clock as source for ToD
# so we depend on time being in sync
# In order for this to have effect, you need to also enable chrony-wait.service (or something similar)
# Comment the next line out if you change to -s nmea below
##After=time-sync.target
# This is not ideal for -s nmea, but I'm not sure what's better.
After=network-online.target

[Service]
Type=simple
EnvironmentFile=-/etc/sysconfig/ts2phc
EnvironmentFile=-/etc/default/ts2phc
# If you change this to -s nmea, then comment out the ordering after time-sync.target above.
##ExecStart=/usr/sbin/ts2phc -s generic $OPTIONS
ExecStart=/usr/sbin/ts2phc -s nmea $OPTIONS

[Install]
WantedBy=multi-user.target

# Configuration file for ts2phc
# For more information about this file, see the ts2phc(8) man page.
[global]
ts2phc.extts_polarity both
ts2phc.pulsewidth 100000000
leapfile /usr/share/zoneinfo/leap-seconds.list
step_threshold 0.1

# these are only used with -s nmea, and are ignored with -s generic
###ts2phc.nmea_serialport /dev/ttyS0
ts2phc.nmea_serialport /dev/ttyS0
# This is only supported with Linux PTP 4.x
# ts2phc.nmea_baudrate 9600

# In LinuxPTP 3.x, you need logging_level to be 7 in order to get messages showing the PPS-PHC offsets.
# With LinuxPTP 4.x, you get these messages at log level 6 (which is the default).
logging_level 7

[enp1s0]

root@ptp2server:/# cat /sys/class/ptp/ptp0/fifo
0 1708394388 16169995

root@ptp2server:/# journalctl -u ts2phc -S -30s
-- No entries --

root@ptp2server:/# phc_ctl enp1s0 cmp
phc_ctl[22958.066]: offset from CLOCK_REALTIME is 1082449982ns

root@ptp2server:/# systemctl restart ts2phc
root@ptp2server:/# journalctl -u ts2phc -S -30s
Feb 19 21:21:28 ptp2server systemd[1]: Started ts2phc.service - Synchronize PTP hardware clock from external timestamp.
Feb 19 21:21:28 ptp2server ts2phc[1035]: no slave clocks specified
Feb 19 21:21:28 ptp2server ts2phc[1035]: usage: ts2phc [options]
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -c [dev|name]  phc slave clock (like /dev/ptp0 or eth0)
Feb 19 21:21:28 ptp2server ts2phc[1035]:                 (may be specified multiple times)
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -f [file]      read configuration from 'file'
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -h             prints this message and exits
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -l [num]       set the logging level to 'num'
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -m             print messages to stdout
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -q             do not print messages to the syslog
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -s [dev|name]  source of the PPS signal
Feb 19 21:21:28 ptp2server ts2phc[1035]:                 may take any of the following forms:
Feb 19 21:21:28 ptp2server ts2phc[1035]:                     generic   - an external 1-PPS without ToD information
Feb 19 21:21:28 ptp2server ts2phc[1035]:                     /dev/ptp0 - a local PTP Hardware Clock (PHC)
Feb 19 21:21:28 ptp2server ts2phc[1035]:                     eth0      - a local PTP Hardware Clock (PHC)
Feb 19 21:21:28 ptp2server ts2phc[1035]:                     nmea      - a gps device connected by serial port or network
Feb 19 21:21:28 ptp2server ts2phc[1035]:  -v             prints the software version and exits
Feb 19 21:21:28 ptp2server systemd[1]: ts2phc.service: Main process exited, code=exited, status=255/EXCEPTION
Feb 19 21:21:28 ptp2server systemd[1]: ts2phc.service: Failed with result 'exit-code'.
root@ptp2server:/# journalctl -u ts2phc -S /dev/ttyS0 -30s
Failed to parse timestamp: /dev/ttyS0
root@ptp2server:/# 
root@ptp2server:/# journalctl -u ts2phc -S /dev/ttyS1 -30s
Failed to parse timestamp: /dev/ttyS1
root@ptp2server:/# 
root@ptp2server:/# journalctl -u ts2phc -S /dev/ttyS1 -30s
Failed to parse timestamp: /dev/ttyS1
root@ptp2server:/# 
root@ptp2server:/# journalctl -u ts2phc -S nmea -30s
Failed to parse timestamp: nmea