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Diffstat (limited to 'Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt')
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diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt b/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt new file mode 100644 index 0000000000..c0e3c3a42b --- /dev/null +++ b/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt @@ -0,0 +1,58 @@ +SPM AVS Wrapper 2 (SAW2) + +The SAW2 is a wrapper around the Subsystem Power Manager (SPM) and the +Adaptive Voltage Scaling (AVS) hardware. The SPM is a programmable +power-controller that transitions a piece of hardware (like a processor or +subsystem) into and out of low power modes via a direct connection to +the PMIC. It can also be wired up to interact with other processors in the +system, notifying them when a low power state is entered or exited. + +Multiple revisions of the SAW hardware are supported using these Device Nodes. +SAW2 revisions differ in the register offset and configuration data. Also, the +same revision of the SAW in different SoCs may have different configuration +data due the differences in hardware capabilities. Hence the SoC name, the +version of the SAW hardware in that SoC and the distinction between cpu (big +or Little) or cache, may be needed to uniquely identify the SAW register +configuration and initialization data. The compatible string is used to +indicate this parameter. + +PROPERTIES + +- compatible: + Usage: required + Value type: <string> + Definition: Must have + "qcom,saw2" + A more specific value could be one of: + "qcom,apq8064-saw2-v1.1-cpu" + "qcom,msm8226-saw2-v2.1-cpu" + "qcom,msm8974-saw2-v2.1-cpu" + "qcom,apq8084-saw2-v2.1-cpu" + +- reg: + Usage: required + Value type: <prop-encoded-array> + Definition: the first element specifies the base address and size of + the register region. An optional second element specifies + the base address and size of the alias register region. + +- regulator: + Usage: optional + Value type: boolean + Definition: Indicates that this SPM device acts as a regulator device + device for the core (CPU or Cache) the SPM is attached + to. + +Example 1: + + power-controller@2099000 { + compatible = "qcom,saw2"; + reg = <0x02099000 0x1000>, <0x02009000 0x1000>; + regulator; + }; + +Example 2: + saw0: power-controller@f9089000 { + compatible = "qcom,apq8084-saw2-v2.1-cpu", "qcom,saw2"; + reg = <0xf9089000 0x1000>, <0xf9009000 0x1000>; + }; |