diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
index 89e62ddc69ca..0703ad3f3c1e 100644
--- a/Documentation/devicetree/bindings/net/meson-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -25,6 +25,22 @@ Required properties on Meson8b and newer:
 		- "clkin0" - first parent clock of the internal mux
 		- "clkin1" - second parent clock of the internal mux
 
+Optional properties on Meson8b and newer:
+- amlogic,tx-delay-ns:	The internal RGMII TX clock delay (provided
+			by this driver) in nanoseconds. Allowed values
+			are: 0ns, 2ns, 4ns, 6ns.
+			When phy-mode is set to "rgmii" then the TX
+			delay should be explicitly configured. When
+			not configured a fallback of 2ns is used.
+			When the phy-mode is set to either "rgmii-id"
+			or "rgmii-txid" the TX clock delay is already
+			provided by the PHY. In that case this
+			property should be set to 0ns (which disables
+			the TX clock delay in the MAC to prevent the
+			clock from going off because both PHY and MAC
+			are adding a delay).
+			Any configuration is ignored when the phy-mode
+			is set to "rmii".
 
 Example for Meson6: