ARM: dts: msm8974-FP2: Introduce gpio-keys nodes

This introduces the gpio-keys nodes for keys of the FP2 and the
associated pinctrl state.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm/boot/dts/qcom-msm8974-fairphone-fp2.dts

 #include "qcom-msm8974.dtsi"
 #include "qcom-pm8841.dtsi"
 #include "qcom-pm8941.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
+
 
 / {
 	model = "Fairphone 2";
@@ -13,6 +17,38 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+		input-name = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&gpio_keys_pin_a>;
+
+		camera-snapshot {
+			label = "camera_snapshot";
+			gpios = <&pm8941_gpios 1 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_CAMERA>;
+			wakeup-source;
+			debounce-interval = <15>;
+		};
+
+		volume-down {
+			label = "volume_down";
+			gpios = <&pm8941_gpios 2 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_VOLUMEDOWN>;
+			wakeup-source;
+			debounce-interval = <15>;
+		};
+
+		volume-up {
+			label = "volume_up";
+			gpios = <&pm8941_gpios 5 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_VOLUMEUP>;
+			wakeup-source;
+			debounce-interval = <15>;
+		};
+	};
 };
 
 &soc {
@@ -20,3 +56,17 @@ serial@f991e000 {
 		status = "ok";
 	};
 };
+
+&spmi_bus {
+	pm8941@0 {
+		gpios@c000 {
+			gpio_keys_pin_a: gpio-keys-active {
+				pins = "gpio1", "gpio2", "gpio5";
+				function = "normal";
+
+				bias-pull-up;
+				power-source = <PM8941_GPIO_S3>;
+			};
+		};
+	};
+};