ARM: dts: samsung: exynos4210-i9100: Add node for touch keys

Add a Device Tree node to support the LED-backed "menu" and "back" keys.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20231206221556.15348-3-paul@crapouillou.netSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

arch/arm/boot/dts/samsung/exynos4210-i9100.dts

@@ -184,6 +184,28 @@ s5k5bafx_ep: endpoint {
 		};
 	};
 
+	i2c-gpio-2 {
+		compatible = "i2c-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		sda-gpios = <&gpk1 2 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		scl-gpios = <&gpk1 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+		i2c-gpio,delay-us = <2>;
+
+		touchscreen@20 {
+			compatible = "cypress,aries-touchkey";
+			reg = <0x20>;
+
+			interrupt-parent = <&gpl0>;
+			interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
+
+			vdd-supply = <&vtouchled_reg>;
+			vcc-supply = <&vtouch_reg>;
+			linux,keycodes = <KEY_MENU>, <KEY_BACK>;
+		};
+	};
+
 	spi-3 {
 		compatible = "spi-gpio";
 		#address-cells = <1>;
@@ -513,7 +535,6 @@ vtouch_reg: LDO11 {
 				regulator-name = "TOUCH_2.8V";
 				regulator-min-microvolt = <2800000>;
 				regulator-max-microvolt = <2800000>;
-				regulator-always-on;
 			};
 
 			vpll_reg: LDO10 {