diff --git a/bindings/iio/adc/qcom,spmi-vadc.yaml b/bindings/iio/adc/qcom,spmi-vadc.yaml
index 55af1348..a70a8102 100644
--- a/bindings/iio/adc/qcom,spmi-vadc.yaml
+++ b/bindings/iio/adc/qcom,spmi-vadc.yaml
@@ -142,6 +142,14 @@ patternProperties:
             from the ADC that is an average of multiple samples. The value
             selected is 2^(value).
 
+      qcom,scale-fn-type:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+            The index of the VADC scale function used to convert raw ADC code to
+            physical scaled unites for the channel. Defined for compatibles
+            "qcom,spmi-adc5" and "qcom,spmi-adc7".
+            See include/dt-bindings/iio/qcom,spmi-vadc.h for values.
+
     required:
       - reg