I plugged a minipcie to 4-channel RS485 EMP2-X404 module into my PC, and there was an additional gpiochip1 under /dev/. I installed the driver provided by the manufacturer and I can see an additional xrserial in /proc/tty/drivers, but there is no /dev/ttyXR under /dev. What is the reason?
My system is Ubuntu 20.04 with kernel 6.1.0.
cat /proc/tty/drivers
/dev/tty /dev/tty 5 0 system:/dev/tty
/dev/console /dev/console 5 1 system:console
/dev/ptmx /dev/ptmx 5 2 system
/dev/vc/0 /dev/vc/0 4 0 system:vtmaster
xrserial /dev/ttyXR 30 0-255 serial
serial /dev/ttyS 4 64-95 serial
pty_slave /dev/pts 136 0-1048575 pty:slave
pty_master /dev/ptm 128 0-1048575 pty:master
unknown /dev/tty 4 1-63 console