OS layers built on top of PSCI to enter low-power states require the
power_state parameter to be passed to the PSCI CPU suspend method.
This parameter is specific to a power state and platform specific,
therefore must be provided by firmware to the OS in order to enable
proper call sequence.
This patch adds a property in the PSCI bindings that describes how
the CPU suspend power_state parameter should be defined in DT in
all device nodes that rely on PSCI CPU suspend method usage.
Reviewed-by: Sebastian Capella <sebcape@xxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
---
Documentation/devicetree/bindings/arm/psci.txt | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt
index b4a58f3..fae3eed 100644
--- a/Documentation/devicetree/bindings/arm/psci.txt
+++ b/Documentation/devicetree/bindings/arm/psci.txt
@@ -50,6 +50,14 @@ Main node optional properties:
- migrate : Function ID for MIGRATE operation
+Device tree nodes that require usage of PSCI CPU_SUSPEND function (ie idle
+states bindings[1]) must specify the following properties:
+
+- entry-method-param
+ Usage: Required for idle states bindings [1].
+ Value type: <u32>
+ Definition: power_state parameter to pass to the PSCI
+ suspend call.
Example:
@@ -64,7 +72,6 @@ Case 1: PSCI v0.1 only.
migrate = <0x95c10003>;
};
-
Case 2: PSCI v0.2 only
psci {
@@ -88,3 +95,6 @@ Case 3: PSCI v0.2 and PSCI v0.1.
...
};
+
+[1] Kernel documentation - ARM idle states bindings
+ Documentation/devicetree/bindings/arm/idle-states.txt
--
1.9.1
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