arm64: dts: rockchip: add nanopi-adc-power to NanoPi 5/6 boards

Author: efectn

arch/arm64/boot/dts/rockchip/rk3568-nanopi5-common.dtsi

@@ -235,8 +235,8 @@
 		voltage-min-design-microvolt = <4500000>;
 	};
 
-	simple_vin: simple-vin {
-		compatible = "simple-adc-power-v1";
+	nanopi_adc_vin: nanopi-adc-vin {
+		compatible = "nanopi-adc-power-v1";
 		io-channels = <&saradc 2>;
 		io-channel-names = "voltage";
 		monitored-battery = <&simple_bat>;

arch/arm64/boot/dts/rockchip/rk3588s-nanopi-r6-common.dtsi

@@ -103,6 +103,19 @@
 		vin-supply = <&vcc5v0_usb>;
 	};
 
+	simple_bat: battery {
+		compatible = "simple-battery";
+		voltage-max-design-microvolt = <21000000>;
+		voltage-min-design-microvolt = <4500000>;
+	};
+
+	nanopi_adc_vin: nanopi-adc-vin {
+		compatible = "nanopi-adc-power-v2";
+		io-channels = <&saradc 2>;
+		io-channel-names = "voltage";
+		monitored-battery = <&simple_bat>;
+	};
+
 	test-power {
 		status = "okay";
 	};