Documentation/devicetree/bindings/power/domain-idle-state.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/power/domain-idle-state.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/power/domain-idle-state.yaml
Extension
.yaml
Size
2270 bytes
Lines
82
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/power/domain-idle-state.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: PM Domain Idle States

maintainers:
  - Ulf Hansson <ulf.hansson@linaro.org>

description:
  A domain idle state node represents the state parameters that will be used to
  select the state when there are no active components in the PM domain.

properties:
  $nodename:
    const: domain-idle-states

patternProperties:
  "^(cpu|cluster|domain)-":
    type: object
    additionalProperties: false
    description:
      Each state node represents a domain idle state description.

    properties:
      compatible:
        const: domain-idle-state

      entry-latency-us:
        description:
          The worst case latency in microseconds required to enter the idle
          state. Note that, the exit-latency-us duration may be guaranteed only
          after the entry-latency-us has passed.

      exit-latency-us:
        description:
          The worst case latency in microseconds required to exit the idle
          state.

      min-residency-us:
        description:
          The minimum residency duration in microseconds after which the idle
          state will yield power benefits, after overcoming the overhead while
          entering the idle state.

      arm,psci-suspend-param:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: |
          power_state parameter to pass to the ARM PSCI suspend call.

          Device tree nodes that require usage of PSCI CPU_SUSPEND function
          (i.e. idle states node with entry-method property is set to "psci")
          must specify this property.

      idle-state-name:
        $ref: /schemas/types.yaml#/definitions/string
        description:
          A string used as a descriptive name for the idle state.

    required:
      - compatible
      - entry-latency-us
      - exit-latency-us
      - min-residency-us

additionalProperties: false

examples:

Annotation

Implementation Notes