arm64: dts: qcom: qrb4210-rb2: Enable on-board buttons

Enable the PMIC GPIO- and RESIN-connected buttons on the board.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230613-topic-rb2_-v1-1-696cd7dbda28@linaro.org

arch/arm64/boot/dts/qcom/qrb4210-rb2.dts

@@ -7,6 +7,7 @@
 
 #include <dt-bindings/leds/common.h>
 #include "sm4250.dtsi"
+#include "pm6125.dtsi"
 
 / {
 	model = "Qualcomm Technologies, Inc. QRB4210 RB2";
@@ -28,6 +29,23 @@ clk40M: can-clk {
 		};
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+		label = "gpio-keys";
+
+		pinctrl-0 = <&kypd_vol_up_n>;
+		pinctrl-names = "default";
+
+		key-volume-up {
+			label = "Volume Up";
+			linux,code = <KEY_VOLUMEUP>;
+			gpios = <&pm6125_gpios 5 GPIO_ACTIVE_LOW>;
+			debounce-interval = <15>;
+			linux,can-disable;
+			wakeup-source;
+		};
+	};
+
 	hdmi-connector {
 		compatible = "hdmi-connector";
 		type = "a";
@@ -219,6 +237,25 @@ &mdss_dsi0_phy {
 	status = "okay";
 };
 
+&pm6125_gpios {
+	kypd_vol_up_n: kypd-vol-up-n-state {
+		pins = "gpio5";
+		function = "normal";
+		power-source = <0>;
+		bias-pull-up;
+		input-enable;
+	};
+};
+
+&pon_pwrkey {
+	status = "okay";
+};
+
+&pon_resin {
+	linux,code = <KEY_VOLUMEDOWN>;
+	status = "okay";
+};
+
 &qupv3_id_0 {
 	status = "okay";
 };