diff --git a/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml b/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
index 3b764415c9ab..66859eb8f79a 100644
--- a/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
+++ b/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
@@ -21,6 +21,11 @@ properties:
     description:
       Regulator for the headphone amplifier
 
+  allwinner,internal-bias-resistor:
+    description:
+      Enable the internal 2.2K bias resistor between HBIAS and MICDET pins
+    type: boolean
+
 required:
   - compatible
   - reg