Get PTP configuration tied up and daemonized

[geerlingguy]

Right now I have a couple tasks in the ptp.yml tasks file that I still need to write:

• Set up the Pi as a PTP grandmaster on eth1: sudo ptp4l -i eth1 -m
  • Maybe set up configuration inside /etc/linuxptp/ptp4l.conf?
• Set up phc2sys to sync the clock on the NIC: phc2sys -a -rr
• (Maybe) use testptp to set PPS out on the proper pin:
  • Install from testptp.c and gcc -Wall -lrt testptp.c -o testptp, then sudo mv testptp /usr/bin/
  • sudo testptp -d /dev/ptp0 -L2,0 (not sure if that's the right pin...?)
  • sudo ./testptp -d /dev/ptp0 -p 1000000000

For reference:

$ phc2sys -h
usage: phc2sys [options]
 automatic configuration:
 -a             turn on autoconfiguration
 -r             synchronize system (realtime) clock
                repeat -r to consider it also as a time source

$ testptp -h
usage: testptp [options]
 -c         query the ptp clock's capabilities
 -d name    device to open
 -l         list the current pin configuration
 -L pin,val configure pin index 'pin' with function 'val'
            the channel index is taken from the '-i' option
            'val' specifies the auxiliary function:
            0 - none
            1 - external time stamp
            2 - periodic output
 -p val     enable output with a period of 'val' nanoseconds

[jauderho]

I was trying to use timemaster to set up both chrony and linuxptp but got sidetracked. Maybe this would be of interest to get both tied together?

[geerlingguy]

@jauderho - I was planning on configuring the individual portions by hand, but timemaster does seem like a potential way to tie it all together as well.

[geerlingguy]

Hmm... also https://github.com/MaciekMachni/ptp_recipes/blob/main/grandmaster.md for a tidy config (assuming NTP not running, in this case; see this NetDevConf presentation).