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- 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 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,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>;
- };
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