This runs PTP as a client on a CM4/CM5 together with an NTP server that is synced from PTP.
We can manage this using the timemaster service, which is part of linuxptp.
Install linuxptp and chrony:
apt install linuxptp chrony
Copy timemaster.conf to /etc/linuxptp/ and then change 192.168.0.10 in the ntp_server line to the address of your NTP server.
Then enable the timemaster service:
sudo systemctl enable timemaster.service
You may get the following error on startup from ptp4l:
interface 'eth0' does not support requested timestamping
You can avoid this by copying [email protected] to /etc/systemd/system/ and then do
sudo systemctl daemon-reload
sudo systemctl enable [email protected]
This service makes sure the PHC is ready before ptp4l runs.