arm64: dts: qcom: sc8280xp-x13s: Add PMK8280 VADC channels

Add VADC channels for measuring the on-chip die temperature and external
crystal osciallator temperature of PMK8280.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221103095810.64606-9-manivannan.sadhasivam@linaro.org

arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts

@@ -7,6 +7,7 @@
 /dts-v1/;
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/iio/qcom,spmi-adc7-pmk8350.h>
 #include <dt-bindings/regulator/qcom,rpmh-regulator.h>
 
 #include "sc8280xp.dtsi"
@@ -173,6 +174,21 @@ &pmk8280_pon_resin {
 	status = "okay";
 };
 
+&pmk8280_vadc {
+	status = "okay";
+
+	pmic-die-temp@3 {
+		reg = <PMK8350_ADC7_DIE_TEMP>;
+		qcom,pre-scaling = <1 1>;
+	};
+
+	xo-therm@44 {
+		reg = <PMK8350_ADC7_AMUX_THM1_100K_PU>;
+		qcom,hw-settle-time = <200>;
+		qcom,ratiometric;
+	};
+};
+
 &qup0 {
 	status = "okay";
 };