66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
QTI DDR cooling device.
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The DDR cooling device will be used to place a DDR frequency vote. This
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cooling device will be used in those cases where all the subsystem's are
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thermally throttled and DDR has to be operated with a minimum performance
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level. This cooling device vote can ensure the same.
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Properties:
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- compatible:
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Usage: required
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Value type: <string>
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Definition: should be "qcom,ddr-cooling-device".
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Bus Scaling Data:
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- qcom,msm-bus,name:
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Usage: required
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Value type: <string>
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Definition: String describing DDR cooling device client. It is defined
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at Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
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- qcom,msm-bus,num-cases:
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Usage: required
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Value type: <integer>
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Definition: This is the number of Bus Scaling use cases
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defined in the vectors property. This must be set to more than
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one for DDR cooling device based on different levels of DDR
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frequency cooling support required. The use-case0 always should
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be a vote to take off DDR cdev votes from the system. It is
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defined at Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
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- qcom,msm-bus,active-only:
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Usage: optional
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Value type: <None>
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Definition: A boolean flag indicating if it is active only
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bandwidth vote. It is defined at
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Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
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- qcom,msm-bus,num-paths:
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Usage: required
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Value type: <integer>
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Definition: This represents total number of master-slave pairs for
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different usecases. It is defined at
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Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
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- qcom,msm-bus,vectors-KBps:
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Usage: required
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Value type: <array>
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Definition: A series of 4 cell properties, with a format of
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(src, dst, ab, ib). It is defined at
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Documentation/devicetree/bindings/arm/msm/msm_bus.txt.
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Cooling Device Property:
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- #cooling-cells:
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Usage: required
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Value type: <integer>
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Definition: Must be 2. Needed for of_thermal as cooling device
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identifier. Please refer to
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<devicetree/bindings/thermal/thermal.txt> for more
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details.
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Example:
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qcom,ddr-cdev {
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compatible = "qcom,ddr-cooling-device";
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qcom,msm-bus,name = "ddr-cdev";
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qcom,msm-bus,num-cases = <2>;
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qcom,msm-bus,num-paths = <1>;
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qcom,msm-bus,vectors-KBps = <1 512 0 0>,
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<1 512 0 366000>;
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#cooling-cells = <2>;
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};
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