arm64: dts: qcom: qcm6490-idp: enable PMIC Volume and Power buttons

The Volume Down & Power buttons are controlled by the PMIC via
the PON hardware, and the Volume Up is connected to a PMIC gpio.

Enable the necessary hardware and setup the GPIO state for the
Volume Up gpio key.
Signed-off-by: Hui Liu <quic_huliu@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240311-gpio-keys-v5-1-08823582f6c9@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/qcm6490-idp.dts

@@ -9,6 +9,7 @@
 #define PM7250B_SID 8
 #define PM7250B_SID1 9
 
+#include <dt-bindings/input/linux-event-codes.h>
 #include <dt-bindings/leds/common.h>
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
@@ -59,6 +60,22 @@ lcd_disp_bias: regulator-lcd-disp-bias {
 		pinctrl-names = "default";
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&key_vol_up_default>;
+		pinctrl-names = "default";
+
+		key-volume-up {
+			label = "Volume_up";
+			gpios = <&pm7325_gpios 6 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_VOLUMEUP>;
+			wakeup-source;
+			debounce-interval = <15>;
+			linux,can-disable;
+		};
+	};
+
 	reserved-memory {
 		xbl_mem: xbl@80700000 {
 			reg = <0x0 0x80700000 0x0 0x100000>;
@@ -511,6 +528,16 @@ pmic_lcd_bl_pwm: pmic-lcd-bl-pwm-state {
 	};
 };
 
+&pm7325_gpios {
+	key_vol_up_default: key-vol-up-state {
+		pins = "gpio6";
+		function = "normal";
+		input-enable;
+		bias-pull-up;
+		qcom,drive-strength = <PMIC_GPIO_STRENGTH_LOW>;
+	};
+};
+
 &pm8350c_pwm {
 	pinctrl-0 = <&pmic_lcd_bl_pwm>;
 	pinctrl-names = "default";
@@ -540,6 +567,15 @@ led@3 {
 	};
 };
 
+&pon_pwrkey {
+	status = "okay";
+};
+
+&pon_resin {
+	linux,code = <KEY_VOLUMEDOWN>;
+	status = "okay";
+};
+
 &qupv3_id_0 {
 	status = "okay";
 };