CPU's idle states are defined by the arm,idle-state compatible flag. See
[1]. PM domains that can contains devices and other domains also has
similar definition for its idle state. Reuse the definition of
arm,idle-state for PM domains by allowing an addition compatible string
("domain-idle-state") to denote idle states that are specific to PM
Domains.

[1]. Documentation/devicetree/bindings/arm/idle-states.txt

Cc: <redacted>
Cc: Rob Herring <robh@kernel.org>
Suggested-by: Sudeep Holla <redacted>
Signed-off-by: Lina Iyer <redacted>
---
 Documentation/devicetree/bindings/arm/idle-states.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/idle-states.txt b/Documentation/devicetree/bindings/arm/idle-states.txt
index b8e41c1..4b0ff59 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.txt
+++ b/Documentation/devicetree/bindings/arm/idle-states.txt

@@ -271,6 +271,9 @@ follows:
 		Usage: Required
 		Value type: <stringlist>
 		Definition: Must be "arm,idle-state".
+			    Additionally, nodes that are used to describe a
+			    idle-state of PM domain must also define
+			    "domain-idle-state" as compatible string.
 
 	- local-timer-stop
 		Usage: See definition

-- 
2.7.4