48 lines
1.9 KiB
Plaintext
48 lines
1.9 KiB
Plaintext
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* Low Power Management Resources
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The application processor in the MSM can enter several different low power
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states depending on the sleep time and on the required system resources. The
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MSM cannot enter a given low power state if that state involves turning off
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some shared resources which are required by some components of the
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system.The lpm-resources device tree node represents the shared resources
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that need to be monitored for usage requirement to check if a given low power
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state can be entered.Each resource is identified by a combination of the name,
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id,type and key which is also used by the RPM to identify a shared resource.
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The name and resource-type are required nodes; the type, id and key are
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optional nodes which are needed if the resource type is RPM shared resource
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(MSM_LPM_RPM_RS_TYPE).
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The nodes for lpm-resources are:
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Required Nodes:
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- compatible: "qcom,lpm-resources"
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- reg: The numeric level id
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- qcom,name: The name of the low power resource represented
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as a string.
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- qcom,init-value: Initialization value of the LPM resource represented as
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decimal value for vdd-dig and vdd-mem resources and
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as string for pxo and l2 resources.
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Optional Nodes:
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- qcom,type: The type of resource used like smps or pxo
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represented as a hex value.
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- qcom,id: The id representing a device within a resource type.
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- qcom,key: The key is the specific attribute of the resource being
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monitored represented as a hex value.
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- qcom,local-resource-type: The property exists only for locally managed
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resource and is represented as a bool.
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Example:
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qcom,lpm-resources@0 {
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reg = <0x0>;
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qcom,name = "vdd-dig";
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qcom,type = <0x62706d73>; /* "smpb" */
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qcom,id = <0x02>;
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qcom,key = <0x6e726f63>; /* "corn" */
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qcom,init-value= <5>; /* Active Corner*/
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};
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