ARM: dts: aspeed: rainier: gpio-keys for PSU presence

Add in a gpio-keys section to the Rainier device tree source, add in the
power supply presence GPIOs.
Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts

@@ -3,6 +3,7 @@
 /dts-v1/;
 
 #include "aspeed-g6.dtsi"
+#include <dt-bindings/gpio/aspeed-gpio.h>
 
 / {
 	model = "Rainier";
@@ -33,6 +34,34 @@ flash_memory: region@B8000000 {
 		};
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		ps0-presence {
+			label = "ps0-presence";
+			gpios = <&gpio0 ASPEED_GPIO(S, 0) GPIO_ACTIVE_LOW>;
+			linux,code = <ASPEED_GPIO(S, 0)>;
+		};
+
+		ps1-presence {
+			label = "ps1-presence";
+			gpios = <&gpio0 ASPEED_GPIO(S, 1) GPIO_ACTIVE_LOW>;
+			linux,code = <ASPEED_GPIO(S, 1)>;
+		};
+
+		ps2-presence {
+			label = "ps2-presence";
+			gpios = <&gpio0 ASPEED_GPIO(S, 2) GPIO_ACTIVE_LOW>;
+			linux,code = <ASPEED_GPIO(S, 2)>;
+		};
+
+		ps3-presence {
+			label = "ps3-presence";
+			gpios = <&gpio0 ASPEED_GPIO(S, 3) GPIO_ACTIVE_LOW>;
+			linux,code = <ASPEED_GPIO(S, 3)>;
+		};
+	};
+
 };
 
 &emmc_controller {