diff --git a/Documentation/devicetree/bindings/sound/simple-audio-amplifier.yaml b/Documentation/devicetree/bindings/sound/simple-audio-amplifier.yaml
index 26379377a7ac3a262c52e98de7c0abd23a01b09e..8327846356d309f130e226808b8442951733261c 100644
--- a/Documentation/devicetree/bindings/sound/simple-audio-amplifier.yaml
+++ b/Documentation/devicetree/bindings/sound/simple-audio-amplifier.yaml
@@ -9,6 +9,9 @@ title: Simple Audio Amplifier Device Tree Bindings
 maintainers:
   - Jerome Brunet <jbrunet@baylibre.com>
 
+allOf:
+  - $ref: name-prefix.yaml#
+
 properties:
   compatible:
     enum:
@@ -22,10 +25,7 @@ properties:
     description: >
       power supply for the device
 
-  sound-name-prefix:
-    $ref: /schemas/types.yaml#/definitions/string
-    description: >
-      See ./name-prefix.txt
+  sound-name-prefix: true
 
 required:
   - compatible