arm64: dts: qcom: sdm660-xiaomi-lavender: Add volume up button

This enables the volume up key.
Signed-off-by: Dang Huynh <danct12@riseup.net>
Tested-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211121170449.1124048-1-danct12@riseup.net

arch/arm64/boot/dts/qcom/sdm660-xiaomi-lavender.dts

@@ -9,6 +9,8 @@
 #include "sdm660.dtsi"
 #include "pm660.dtsi"
 #include "pm660l.dtsi"
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/input/gpio-keys.h>
 
 / {
 	model = "Xiaomi Redmi Note 7";
@@ -46,6 +48,17 @@ vph_pwr: vph-pwr-regulator {
 		regulator-boot-on;
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		volup {
+			label = "Volume Up";
+			gpios = <&pm660l_gpios 7 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_VOLUMEUP>;
+			debounce-interval = <15>;
+		};
+	};
+
 	reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;