Symbol: UPF_EXAR_EFR
drivers/tty/serial/8250/8250_exar.c
1486
uart.port.flags = UPF_SHARE_IRQ | UPF_EXAR_EFR | UPF_FIXED_TYPE | UPF_FIXED_PORT;
drivers/tty/serial/8250/8250_port.c
2746
if (port->flags & UPF_EXAR_EFR)