dts: nxp: k6x: add temperature sensor nodes

Add device tree nodes for the internal temperature sensor in the NXP
Kinetis K6x SoC series.

A temperature sensor node is added for each ADC in the SoC to allow
the user to choose which ADC instance to use for the sensor readings.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
diff --git a/dts/arm/nxp/nxp_k6x.dtsi b/dts/arm/nxp/nxp_k6x.dtsi
index 639a9ec..7a64ced 100644
--- a/dts/arm/nxp/nxp_k6x.dtsi
+++ b/dts/arm/nxp/nxp_k6x.dtsi
@@ -73,6 +73,30 @@
 		reg = <0x20000000 0x30000>;
 	};
 
+	temp0: temp0 {
+		compatible = "nxp,kinetis-temperature";
+		io-channels = <&adc0 26>, <&adc0 27>;
+		io-channel-names = "SENSOR", "BANDGAP";
+		bandgap-voltage = <1000000>;
+		vtemp25 = <716000>;
+		sensor-slope-cold = <1620>;
+		sensor-slope-hot = <1620>;
+		label = "TEMP0";
+		status = "disabled";
+	};
+
+	temp1: temp1 {
+		compatible = "nxp,kinetis-temperature";
+		io-channels = <&adc1 26>, <&adc1 27>;
+		io-channel-names = "SENSOR", "BANDGAP";
+		bandgap-voltage = <1000000>;
+		vtemp25 = <716000>;
+		sensor-slope-cold = <1620>;
+		sensor-slope-hot = <1620>;
+		label = "TEMP1";
+		status = "disabled";
+	};
+
 	soc {
 
 		mpu@4000d000 {