Add a place holder phandle for a cluster to define cluster specific
properties like PM domain definitions etc.

Cc: Rob Herring <robherri...@gmail.com>
Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Signed-off-by: Lina Iyer <lina.i...@linaro.org>
---
 Documentation/devicetree/bindings/arm/topology.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/topology.txt 
b/Documentation/devicetree/bindings/arm/topology.txt
index 1061faf..12b4082 100644
--- a/Documentation/devicetree/bindings/arm/topology.txt
+++ b/Documentation/devicetree/bindings/arm/topology.txt
@@ -109,6 +109,14 @@ Bindings for cluster/cpu/thread nodes are defined as 
follows:
        The cluster node name must be "clusterN" as described in 2.1 above.
        A cluster node can not be a leaf node.
 
+       Properties for a cluster node are -
+
+       -cluster
+               Usage: Optional
+               Value type: <phandle>
+               Definition: a phandle to a cluster node that corresponds to
+                           this cluster.
+
        A cluster node's child nodes must be:
 
        - one or more cluster nodes; or
-- 
2.1.4

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