ARM: dts: ux500: samsung-golden: Add touchkey

Adds support for the back and menu keys on golden.
Signed-off-by: Nick Reitemeyer <nick.reitemeyer@web.de>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200621193822.133683-2-nick.reitemeyer@web.deSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-ux500-samsung-golden.dts

@@ -24,6 +24,32 @@ chosen {
 		stdout-path = &serial2;
 	};
 
+	i2c-gpio-0 {
+		compatible = "i2c-gpio";
+		sda-gpios = <&gpio2 14 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpio2 13 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&i2c_gpio_0_default>;
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		touchkey@20 {
+			compatible = "coreriver,tc360-touchkey";
+			reg = <0x20>;
+			vdd-supply = <&ab8500_ldo_aux4_reg>;
+			vcc-supply = <&ab8500_ldo_aux6_reg>;
+
+			interrupt-parent = <&gpio2>;
+			interrupts = <15 IRQ_TYPE_EDGE_FALLING>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&touchkey_default>;
+			linux,keycodes = <KEY_MENU KEY_BACK>;
+		};
+	};
+
 	i2c-gpio-1 {
 		compatible = "i2c-gpio";
 		sda-gpios = <&gpio4 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
@@ -403,6 +429,16 @@ golden_cfg1 {
 		};
 	};
 
+	i2c-gpio-0 {
+		i2c_gpio_0_default: i2c_gpio_0 {
+			golden_cfg1 {
+				pins = "GPIO77",	/* TOUCHKEY_SCL */
+				       "GPIO78";	/* TOUCHKEY_SDA */
+				ste,config = <&gpio_in_nopull>;
+			};
+		};
+	};
+
 	i2c-gpio-1 {
 		i2c_gpio_1_default: i2c_gpio_1 {
 			golden_cfg1 {
@@ -413,6 +449,15 @@ golden_cfg1 {
 		};
 	};
 
+	touchkey {
+		touchkey_default: touchkey_default {
+			golden_cfg1 {
+				pins = "GPIO79";	/* TOUCHKEY_INT */
+				ste,config = <&gpio_in_nopull>;
+			};
+		};
+	};
+
 	sdi0 {
 		sd_level_translator_default: sd_level_translator_default {
 			golden_cfg1 {