diff --git a/drivers/serial/vr41xx_siu.c b/drivers/serial/vr41xx_siu.c
index aa382e2..0b35097 100644
--- a/drivers/serial/vr41xx_siu.c
+++ b/drivers/serial/vr41xx_siu.c
@@ -800,7 +800,8 @@
 		port->membase = ioremap(port->mapbase, siu_port_size(port));
 	}
 
-	vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
+	if (port->type == PORT_VR41XX_SIU)
+		vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 
 	if (options != NULL)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);