RPMh power controller hosts mx domain that can be used as thermal
warming device. Add a sub-node to specify this.

Signed-off-by: Thara Gopinath <thara.gopin...@linaro.org>
---
 Documentation/devicetree/bindings/power/qcom,rpmpd.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt 
b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
index eb35b22..fff695d 100644
--- a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
+++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
@@ -18,6 +18,16 @@ Required Properties:
 Refer to <dt-bindings/power/qcom-rpmpd.h> for the level values for
 various OPPs for different platforms as well as Power domain indexes
 
+= SUBNODES
+RPMh alsp hosts power domains that can behave as thermal warming device.
+These are expressed as subnodes of the RPMh. The name of the node is used
+to identify the power domain and must therefor be "mx".
+
+- #cooling-cells:
+       Usage: optional
+       Value type: <u32>
+       Definition: must be 2
+
 Example: rpmh power domain controller and OPP table
 
 #include <dt-bindings/power/qcom-rpmhpd.h>
-- 
2.1.4

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