diff --git a/Documentation/devicetree/bindings/net/macb.txt b/Documentation/devicetree/bindings/net/macb.txt
index 1506e948610c79a564b1e9e57f69066a0d044db9..27966ae741e09a51180ee45c92bf3da05f879ce9 100644
--- a/Documentation/devicetree/bindings/net/macb.txt
+++ b/Documentation/devicetree/bindings/net/macb.txt
@@ -22,6 +22,7 @@ Required properties:
 	Required elements: 'pclk', 'hclk'
 	Optional elements: 'tx_clk'
 	Optional elements: 'rx_clk' applies to cdns,zynqmp-gem
+	Optional elements: 'tsu_clk'
 - clocks: Phandles to input clocks.
 
 Optional properties for PHY child node: