diff --git a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
index 0566493c4def020546ee3157e6b7b10d748f7baf..0ab07759b47289c5950364b83cc2e38a310a0cdd 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
+++ b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
@@ -186,6 +186,13 @@ properties:
     description: Clock Delay Buffer Select
     $ref: "/schemas/types.yaml#/definitions/uint32"
 
+  ti,fails-without-test-cd:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      When present, indicates that the CD line is not connected
+      and the controller is required to be forced into Test mode
+      to set the TESTCD bit.
+
 required:
   - compatible
   - reg