ARM: ux500: Add support for gpio-keys and Proximity Sensor for HREF

Here we ensure the SFH7741 Proximity Sensor is registered through
gpio-keys when booting with Device Tree enabled.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

arch/arm/boot/dts/href.dtsi

@@ -16,6 +16,17 @@ memory {
 		reg = <0x00000000 0x20000000>;
 	};
 
+	gpio_keys {
+		compatible = "gpio-keys";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		button@1 {
+			linux,code = <11>;
+			label = "SFH7741 Proximity Sensor";
+		};
+	};
+
 	soc-u9500 {
 		uart@80120000 {
 			status = "okay";

arch/arm/boot/dts/hrefprev60.dts

@@ -17,6 +17,12 @@ / {
 	model = "ST-Ericsson HREF (pre-v60) platform with Device Tree";
 	compatible = "st-ericsson,mop500";
 
+	gpio_keys {
+		button@1 {
+			gpios = <&tc3589x_gpio 7 0x4>;
+		};
+	};
+
 	soc-u9500 {
 		i2c@80004000 {
 			tps61052@33 {

arch/arm/boot/dts/hrefv60plus.dts

@@ -16,4 +16,10 @@
 / {
 	model = "ST-Ericsson HREF (v60+) platform with Device Tree";
 	compatible = "st-ericsson,hrefv60+";
+
+	gpio_keys {
+		button@1 {
+			gpios = <&gpio6 25 0x4>;
+		};
+	};
 };