@@ -42,6 +42,14 @@ 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:
@@ -53,3 +61,6 @@ Example:
cpu_on = <0x95c10002>;
migrate = <0x95c10003>;
};
+
+[1] Kernel documentation - ARM idle states bindings
+ Documentation/devicetree/bindings/arm/idle-states.txt
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. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- Documentation/devicetree/bindings/arm/psci.txt | 11 +++++++++++ 1 file changed, 11 insertions(+)