[PATCH 3/9] arm64: dts: rockchip: rk3588s-nanopi: add voltage iio-hwmon device

[Joachim Eastwood via B4 Relay]

From: Joachim Eastwood <joachim.eastwood at gmail.com>

The NanoPi 6 series have a resistor divider on the main input supply to
support voltage measurements. Hook this up as a hwmon device so it is
possible to monitor the voltage.

Output from sensors on NanoPi-M6:
vdd_usbc_iio_hwmon-isa-0000
Adapter: ISA adapter
in1:     19.80 V

Signed-off-by: Joachim Eastwood <joachim.eastwood at gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3588s-nanopi.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-nanopi.dtsi b/arch/arm64/boot/dts/rockchip/rk3588s-nanopi.dtsi
index 8c77ee71ebf8..a47677926a59 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-nanopi.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-nanopi.dtsi
@@ -95,6 +95,19 @@ vcc5v0_host_20: regulator-vcc5v0-host-20 {
 		regulator-max-microvolt = <5000000>;
 		vin-supply = <&vcc5v0_sys>;
 	};
+
+	vdiv_vdd_usbc: voltage-divider-vdd-usbc {
+		compatible = "voltage-divider";
+		#io-channel-cells = <1>;
+		io-channels = <&saradc 2>;
+		output-ohms = <10000>;
+		full-ohms = <110000>;
+	};
+
+	vdd-usbc-iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&vdiv_vdd_usbc 0>;
+	};
 };
 
 &combphy0_ps {

-- 
2.56.0