ARM: sun8i: a33: add thermal sensor

This adds the DT node for the thermal sensor present in the Allwinner
A33 GPADC.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-a33.dtsi

@@ -154,6 +154,11 @@ de: display-engine {
 		status = "disabled";
 	};
 
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&ths>;
+	};
+
 	mali_opp_table: gpu-opp-table {
 		compatible = "operating-points-v2";
 
@@ -266,6 +271,13 @@ codec: codec@01c22e00 {
 			status = "disabled";
 		};
 
+		ths: ths@01c25000 {
+			compatible = "allwinner,sun8i-a33-ths";
+			reg = <0x01c25000 0x100>;
+			#thermal-sensor-cells = <0>;
+			#io-channel-cells = <0>;
+		};
+
 		fe0: display-frontend@01e00000 {
 			compatible = "allwinner,sun8i-a33-display-frontend";
 			reg = <0x01e00000 0x20000>;