Symbol: RP2_TXRX_CTL_LOOP_m
drivers/tty/serial/rp2.c
300
RP2_TXRX_CTL_DTR_m | RP2_TXRX_CTL_RTS_m | RP2_TXRX_CTL_LOOP_m,
drivers/tty/serial/rp2.c
303
((mctrl & TIOCM_LOOP) ? RP2_TXRX_CTL_LOOP_m : 0));