ARM: dts: wpcm450-supermicro-x9sci-ln4f: Add GPIO LEDs and buttons

The Supermicro X9SCi-LN4F server mainboard has a two LEDs and a button
under the control of the BMC. This patch makes them accessible under
Linux running on the BMC.
Signed-off-by: NJonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220129115228.2257310-9-j.neuschaefer@gmx.netSigned-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/nuvoton-wpcm450-supermicro-x9sci-ln4f.dts

@@ -8,6 +8,9 @@
 
 #include "nuvoton-wpcm450.dtsi"
 
+#include <dt-bindings/input/linux-event-codes.h>
+#include <dt-bindings/gpio/gpio.h>
+
 / {
 	model = "Supermicro X9SCi-LN4F BMC";
 	compatible = "supermicro,x9sci-ln4f-bmc", "nuvoton,wpcm450";
@@ -20,6 +23,46 @@
 		device_type = "memory";
 		reg = <0 0x08000000>; /* 128 MiB */
 	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+		pinctrl-names = "default";
+		pinctrl-0 = <&key_pins>;
+
+		uid {
+			label = "UID button";
+			linux,code = <KEY_HOME>;
+			gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+		pinctrl-names = "default";
+		pinctrl-0 = <&led_pins>;
+
+		uid {
+			label = "UID";
+			gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
+		};
+
+		heartbeat {
+			label = "heartbeat";
+			gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
+&pinctrl {
+	key_pins: mux-keys {
+		groups = "gspi", "sspi";
+		function = "gpio";
+	};
+
+	led_pins: mux-leds {
+		groups = "hg3", "hg0", "pwm4";
+		function = "gpio";
+	};
 };
 
 &serial0 {