Documentation/devicetree/bindings/timer/arm,twd-timer.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/timer/arm,twd-timer.yaml

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/timer/arm,twd-timer.yaml
Extension
.yaml
Size
1189 bytes
Lines
57
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-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/timer/arm,twd-timer.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ARM Timer-Watchdog Timer

maintainers:
  - Rob Herring <robh@kernel.org>

description:
  ARM 11MP, Cortex-A5 and Cortex-A9 are often associated with a per-core
  Timer-Watchdog (aka TWD), which provides both a per-cpu local timer
  and watchdog.

  The TWD is usually attached to a GIC to deliver its two per-processor
  interrupts.

properties:
  compatible:
    enum:
      - arm,cortex-a9-twd-timer
      - arm,cortex-a5-twd-timer
      - arm,arm11mp-twd-timer

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clocks:
    maxItems: 1

  always-on:
    description:
      If present, the timer is powered through an always-on power domain,
      therefore it never loses context.

required:
  - compatible
  - reg
  - interrupts

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>

    timer@2c000600 {
        compatible = "arm,arm11mp-twd-timer";
        reg = <0x2c000600 0x20>;
        interrupts = <GIC_PPI 13 0xf01>;
    };

Annotation

Implementation Notes