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diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index fc446347ab6d..b2aacbe16ed9 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -227,6 +227,15 @@ nodes to be present and contain the properties described below.
# List of phandles to idle state nodes supported
by this cpu [3].
+ - rockchip,pmu
+ Usage: optional for systems that have an "enable-method"
+ property value of "rockchip,rk3066-smp"
+ While optional, it is the preferred way to get access to
+ the cpu-core power-domains.
+ Value type: <phandle>
+ Definition: Specifies the syscon node controlling the cpu core
+ power domains.
+
Example 1 (dual-cluster big.LITTLE system 32-bit):
cpus {