diff --git a/Documentation/devicetree/bindings/arm/omap/prm-inst.txt b/Documentation/devicetree/bindings/arm/omap/prm-inst.txt
index fcd3456afbbe338ad5175282fdef2847f8aaf78e..42db138e091a163d550015d81fb1c0b7347f61fa 100644
--- a/Documentation/devicetree/bindings/arm/omap/prm-inst.txt
+++ b/Documentation/devicetree/bindings/arm/omap/prm-inst.txt
@@ -18,6 +18,7 @@ Required properties:
 		(base address and length)
 
 Optional properties:
+- #power-domain-cells:	Should be 0 if the instance is a power domain provider.
 - #reset-cells:	Should be 1 if the PRM instance in question supports resets.
 
 Example:
@@ -25,5 +26,6 @@ Example:
 prm_dsp2: prm@1b00 {
 	compatible = "ti,dra7-prm-inst", "ti,omap-prm-inst";
 	reg = <0x1b00 0x40>;
+	#power-domain-cells = <0>;
 	#reset-cells = <1>;
 };