diff --git a/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml b/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
index 64ce8bc8bd36..cc5b5284c267 100644
--- a/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
+++ b/Documentation/devicetree/bindings/iio/proximity/tyhx,hx9023s.yaml
@@ -28,6 +28,9 @@ properties:
 
   vdd-supply: true
 
+  firmware-name:
+    maxItems: 1
+
   "#address-cells":
     const: 1
 
@@ -65,6 +68,7 @@ examples:
         interrupt-parent = <&pio>;
         interrupts = <16 IRQ_TYPE_EDGE_FALLING>;
         vdd-supply = <&pp1800_prox>;
+        firmware-name = "hx9023s.bin";
 
         #address-cells = <1>;
         #size-cells = <0>;