diff --git a/Documentation/devicetree/bindings/pinctrl/amlogic,meson8-pinctrl-aobus.yaml b/Documentation/devicetree/bindings/pinctrl/amlogic,meson8-pinctrl-aobus.yaml
index add83c676327..76c02c6af645 100644
--- a/Documentation/devicetree/bindings/pinctrl/amlogic,meson8-pinctrl-aobus.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/amlogic,meson8-pinctrl-aobus.yaml
@@ -9,9 +9,6 @@ title: Amlogic Meson8 AOBUS pinmux controller
 maintainers:
   - Neil Armstrong <neil.armstrong@linaro.org>
 
-allOf:
-  - $ref: amlogic,meson-pinctrl-common.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -25,6 +22,25 @@ properties:
           - const: amlogic,meson8m2-aobus-pinctrl
           - const: amlogic,meson8-aobus-pinctrl
 
+  reg:
+    maxItems: 1
+
+allOf:
+  - $ref: amlogic,meson-pinctrl-common.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,meson8-aobus-pinctrl
+              - amlogic,meson8b-aobus-pinctrl
+    then:
+      required:
+        - reg
+    else:
+      properties:
+        reg: false
+
 required:
   - compatible