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author | Olof Johansson <olof@lixom.net> | 2013-02-11 09:05:45 -0800 |
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committer | Olof Johansson <olof@lixom.net> | 2013-02-11 09:05:45 -0800 |
commit | 3ad06d1a7dfd99a2e8f3a41e0fa5118551186d3c (patch) | |
tree | 0cc362f48415c6de501c2474572be94a37014657 /Documentation/devicetree | |
parent | 4f5c1c04f8623387ce4af942b2bf547d3bba40ae (diff) | |
parent | 2bdd424f26be1c98b6e3d9acfffb5559c131c888 (diff) | |
download | blackbird-op-linux-3ad06d1a7dfd99a2e8f3a41e0fa5118551186d3c.tar.gz blackbird-op-linux-3ad06d1a7dfd99a2e8f3a41e0fa5118551186d3c.zip |
Merge branch 'depends/rmk-psci' into next/virt
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r-- | Documentation/devicetree/bindings/arm/psci.txt | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt new file mode 100644 index 000000000000..433afe9cb590 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/psci.txt @@ -0,0 +1,55 @@ +* Power State Coordination Interface (PSCI) + +Firmware implementing the PSCI functions described in ARM document number +ARM DEN 0022A ("Power State Coordination Interface System Software on ARM +processors") can be used by Linux to initiate various CPU-centric power +operations. + +Issue A of the specification describes functions for CPU suspend, hotplug +and migration of secure software. + +Functions are invoked by trapping to the privilege level of the PSCI +firmware (specified as part of the binding below) and passing arguments +in a manner similar to that specified by AAPCS: + + r0 => 32-bit Function ID / return value + {r1 - r3} => Parameters + +Note that the immediate field of the trapping instruction must be set +to #0. + + +Main node required properties: + + - compatible : Must be "arm,psci" + + - method : The method of calling the PSCI firmware. Permitted + values are: + + "smc" : SMC #0, with the register assignments specified + in this binding. + + "hvc" : HVC #0, with the register assignments specified + in this binding. + +Main node optional properties: + + - cpu_suspend : Function ID for CPU_SUSPEND operation + + - cpu_off : Function ID for CPU_OFF operation + + - cpu_on : Function ID for CPU_ON operation + + - migrate : Function ID for MIGRATE operation + + +Example: + + psci { + compatible = "arm,psci"; + method = "smc"; + cpu_suspend = <0x95c10000>; + cpu_off = <0x95c10001>; + cpu_on = <0x95c10002>; + migrate = <0x95c10003>; + }; |