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diff --git a/doc/device-tree-bindings/phy/no-op.txt b/doc/device-tree-bindings/phy/no-op.txt
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+NOP PHY driver
+
+This driver is used to stub PHY operations in a driver (USB, SATA).
+This is useful when the 'client' driver (USB, SATA, ...) uses the PHY framework
+and there is no actual PHY harwdare to drive.
+
+Required properties:
+- compatible     : must contain "nop-phy"
+- #phy-cells     : must contain <0>
+
+Example:
+
+nop_phy {
+	compatible = "nop-phy";
+	#phy-cells = <0>;
+};