ARM: dts: qcom: msm8974-klte: Add gpio-keys nodes

This introduces the gpio-keys nodes for volume/home keys and the
associated pinctrl state.
Signed-off-by: Daniele Debernardi <drebrez@gmail.com>
Link: https://lore.kernel.org/r/20200411182122.2677248-4-iskren.chernev@gmail.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts

 // SPDX-License-Identifier: GPL-2.0
 #include "qcom-msm8974pro.dtsi"
 #include "qcom-pma8084.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 
 / {
 	model = "Samsung Galaxy S5";
@@ -205,4 +208,50 @@ serial@f991e000 {
 		status = "ok";
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+		input-name = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&gpio_keys_pin_a>;
+
+		volume-down {
+			label = "volume_down";
+			gpios = <&pma8084_gpios 2 GPIO_ACTIVE_LOW>;
+			linux,input-type = <1>;
+			linux,code = <KEY_VOLUMEDOWN>;
+			debounce-interval = <15>;
+		};
+
+		home-key {
+			label = "home_key";
+			gpios = <&pma8084_gpios 3 GPIO_ACTIVE_LOW>;
+			linux,input-type = <1>;
+			linux,code = <KEY_HOMEPAGE>;
+			wakeup-source;
+			debounce-interval = <15>;
+		};
+
+		volume-up {
+			label = "volume_up";
+			gpios = <&pma8084_gpios 5 GPIO_ACTIVE_LOW>;
+			linux,input-type = <1>;
+			linux,code = <KEY_VOLUMEUP>;
+			debounce-interval = <15>;
+		};
+	};
+};
+
+&spmi_bus {
+	pma8084@0 {
+		gpios@c000 {
+			gpio_keys_pin_a: gpio-keys-active {
+				pins = "gpio2", "gpio3", "gpio5";
+				function = "normal";
+
+				bias-pull-up;
+				power-source = <PMA8084_GPIO_S4>;
+			};
+		};
+	};
 };