1 files changed, 30 insertions, 1 deletions

diff --git a/arch/arm/boot/dts/kirkwood-openrd.dtsi b/arch/arm/boot/dts/kirkwood-openrd.dtsi
index f65b7273bb0a..24f1d30970a0 100644
--- a/arch/arm/boot/dts/kirkwood-openrd.dtsi
+++ b/arch/arm/boot/dts/kirkwood-openrd.dtsi
@@ -40,7 +40,7 @@
                         pinctrl-0 = <&pmx_select28 &pmx_sdio_cd &pmx_select34>;
                         pinctrl-names = "default";
 
-                        pmx_select28: pmx-select-rs232-rs484 {
+                        pmx_select28: pmx-select-rs232-rs485 {
                                 marvell,pins = "mpp28";
                                 marvell,function = "gpio";
                         };
@@ -65,10 +65,39 @@
                         status = "okay";
                         cd-gpios = <&gpio0 29 9>;
                 };
+                gpio@10100 {
+                        p28 {
+                                gpio-hog;
+                                gpios = <28 GPIO_ACTIVE_HIGH>;
+                                /*
+                                 * SelRS232or485 selects between RS-232 or RS-485
+                                 * mode for the second UART.
+                                 *
+                                 * Low: RS-232
+                                 * High: RS-485
+                                 *
+                                 * To use the second UART, you need to change also
+                                 * the SelUARTorSD.
+                                 */
+                                output-low;
+                                line-name = "SelRS232or485";
+                        };
+                };
                 gpio@10140 {
                         p2 {
                                 gpio-hog;
                                 gpios = <2 GPIO_ACTIVE_HIGH>;
+                                /*
+                                 * SelUARTorSD selects between the second UART
+                                 * (serial@12100) and SD (mvsdio@90000).
+                                 *
+                                 * Low: UART
+                                 * High: SD
+                                 *
+                                 * When changing this line make sure the newly
+                                 * selected device node is enabled and the
+                                 * previously selected device node is disabled.
+                                 */
                                 output-high; /* Select SD by default */
                                 line-name = "SelUARTorSD";
                         };