diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 078fb7889593..1040d06cc0d7 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -252,6 +252,14 @@ properties:
     minimum: 0
     maximum: 0x3f
 
+  snps,ref-clock-period-ns:
+    description:
+      Value for REFCLKPER field of GUCTL register for reference clock period in
+      nanoseconds, when the hardware set default does not match the actual
+      clock.
+    minimum: 1
+    maximum: 0x3ff
+
   snps,rx-thr-num-pkt-prd:
     description:
       Periodic ESS RX packet threshold count (host mode only). Set this and