56 lines
2.1 KiB
Text
56 lines
2.1 KiB
Text
* MSM Subsystem Power Manager (spm-v2)
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S4 generation of MSMs have SPM hardware blocks to control the Application
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Processor Sub-System power. These SPM blocks run individual state machine
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to determine what the core (L2 or Krait/Scorpion) would do when the WFI
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instruction is executed by the core. The SAW hardware block handles SPM and
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AVS functionality for the cores.
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The devicetree representation of the SPM block should be:
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Required properties
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- compatible: "qcom,spm-v2"
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- reg: The physical address and the size of the SPM's memory mapped registers
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- qcom,cpu: phandle for the CPU that the SPM block is attached to. This field
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is required on only for SPMs that control the CPU. This field is not required
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for SPMs that control L2/CCI/L3
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- qcom,saw2-ver-reg: The location of the version register
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- qcom,name: The name with which a SPM device is identified by the power
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management code.
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Optional properties:
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- qcom,saw2-avs-ctl: The AVS control register
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- qcom,saw2-avs-hysterisis: The AVS hysterisis register to delay the AVS
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controller requests
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- qcom,vctl-timeout-us: The timeout value in us to wait for voltage to change
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after sending the voltage command to the PMIC
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- qcom,saw2-avs-limit: The AVS limit register
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- qcom,saw2-avs-dly: The AVS delay register is used to specify the delay values
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between AVS controller requests
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- qcom,vctl-port: The PVC (PMIC Virtual Channel) port used for changing
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voltage
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- qcom,vctl-port-ub: The PVC (PMIC Virtual Channel) port used for changing
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voltage
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- qcom,phase-port: The PVC port used for changing the number of phases
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- qcom,pfm-port: The PVC port used for enabling PWM/PFM modes
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- qcom,cpu-vctl-list: List of cpu node phandles, whose voltage the spm device
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can control.
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Example :
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qcom,spm@9A10000 {
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compatible = "qcom,spm-v2";
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#address-cells = <1>;
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#size-cells = <1>;
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reg = <0x9A10000 0x1000>;
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qcom,name = "system-cbf"; /* CBF SAW */
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qcom,saw2-ver-reg = <0xFD0>;
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qcom,cpu-vctl-list = <&CPU0 &CPU1 &CPU2 &CPU3>;
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qcom,vctl-timeout-us = <50>;
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qcom,vctl-port = <0x0>;
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qcom,phase-port = <0x1>;
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qcom,saw2-avs-ctl = <0x1100>;
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qcom,pfm-port = <0x2>;
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};
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