Hi @Muzzy ,
you can try to change the permission in a udev rule.
For this you need to create a file like 99-watchdog.rules in the directory /etc/udev/rules.d.
In this file I added the line KERNEL=="watchdog", OWNER="torizon", GROUP="torizon". This changes the owner of the watchdog to the Torizon user.
If you want to be more specific you can see all the attributes of the verdin-watchdog by running udevadm info -a -n /dev/verdin-watchdog
Hope this helps.
Best Regards
Kevin