UART2 ON J5 BEAGLEBONE GREEN

HII

i have beaglebone green with 4.19 kernel on it , on the beaglebone green j5 there a connector which is connected to uart2 .
and if i add the uart2 device tree to uEnv.txt /lib/firmware/BB-UART2-00A0.dtbo

whats is the number of tty that i have to use in order to send a byte on uart2 ?