[PATCH v5 2/8] Documentation: devicetree: psci: define CPU suspend parameter
From: Lorenzo Pieralisi <hidden>
Date: 2014-06-25 14:10:15
Also in:
linux-devicetree, linux-pm
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> Signed-off-by: Lorenzo Pieralisi <redacted> --- 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