root@am335x-evm:~# ptp4l -i hsr0 -f ptp_slave.cfg -m -s
option slaveOnly is deprecated, please use clientOnly instead
ptp4l[1091.465]: ioctl SIOCETHTOOL failed: Operation not supported
ptp4l[1091.470]: interface 'hsr0' does not support requested timestamping mode
failed to create a clock