diff options
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index c532235f8d55..9930023e924c 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3502,6 +3502,14 @@ int uart_get_rs485_mode(struct uart_port *port) if (!(port->rs485_supported.flags & SER_RS485_ENABLED)) return 0; + /* + * Retrieve properties only if a firmware node exists. If no firmware + * node exists, then don't touch rs485 config and keep initial rs485 + * properties set by driver. + */ + if (!dev_fwnode(dev)) + return 0; + ret = device_property_read_u32_array(dev, "rs485-rts-delay", rs485_delay, 2); if (!ret) { |