ARM: dts: qcom: msm8960: expressatt: Add gpio-keys

Adds volume up, volume down, and home keys to expressatt
Signed-off-by: Rudraksha Gupta <guptarud@gmail.com>
Link: https://lore.kernel.org/r/20240120-expressatt-gpio-keys-v1-1-4da7e37440b1@gmail.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm/boot/dts/qcom/qcom-msm8960-samsung-expressatt.dts

@@ -4,6 +4,9 @@
 
 #include "qcom-msm8960.dtsi"
 #include "pm8921.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
+#include <dt-bindings/input/gpio-keys.h>
 
 / {
 	model = "Samsung Galaxy Express SGH-I437";
@@ -19,6 +22,36 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&gpio_keys_pin_a>;
+
+		key-home {
+			label = "Home";
+			gpios = <&msmgpio 40 GPIO_ACTIVE_LOW>;
+			debounce-interval = <5>;
+			linux,code = <KEY_HOMEPAGE>;
+			wakeup-event-action = <EV_ACT_ASSERTED>;
+			wakeup-source;
+		};
+
+		key-volume-up {
+			label = "Volume Up";
+			gpios = <&msmgpio 50 GPIO_ACTIVE_LOW>;
+			debounce-interval = <5>;
+			linux,code = <KEY_VOLUMEUP>;
+		};
+
+		key-volume-down {
+			label = "Volume Down";
+			gpios = <&msmgpio 81 GPIO_ACTIVE_LOW>;
+			debounce-interval = <5>;
+			linux,code = <KEY_VOLUMEDOWN>;
+		};
+	};
 };
 
 &gsbi5 {
@@ -83,6 +116,13 @@ clk-pins {
 			bias-disable;
 		};
 	};
+
+	gpio_keys_pin_a: gpio-keys-active-state {
+		pins = "gpio40", "gpio50", "gpio81";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-disable;
+	};
 };
 
 &pm8921 {