On Thu, Mar 26, 2020 at 12:14:21AM +0100, Heiko Stuebner wrote: > --- a/drivers/tty/serial/serial_core.c > +++ b/drivers/tty/serial/serial_core.c > @@ -3356,6 +3356,18 @@ int uart_get_rs485_mode(struct uart_port *port) > rs485conf->flags |= SER_RS485_TERMINATE_BUS; > } > > + port->rs485_re_gpio = devm_gpiod_get(dev, "rs485-rx-enable", > + GPIOD_FLAGS_BIT_DIR_OUT); I think you want to use GPIOD_OUT_HIGH here so that rs485 reception is enabled by default and only disabled at runtime when sending (if half-duplex mode is used). Thanks, Lukas
