Documentation/devicetree/bindings/hwmon/aspeed,ast2400-pwm-tacho.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/hwmon/aspeed,ast2400-pwm-tacho.yaml

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/hwmon/aspeed,ast2400-pwm-tacho.yaml
Extension
.yaml
Size
2358 bytes
Lines
107
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

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

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/hwmon/aspeed,ast2400-pwm-tacho.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: ASPEED AST2400/AST2500 PWM and Fan Tacho controller

maintainers:
  - Joel Stanley <joel@jms.id.au>
  - Andrew Jeffery <andrew@codeconstruct.com.au>

description: >
  The ASPEED PWM controller can support up to 8 PWM outputs. The ASPEED Fan
  Tacho controller can support up to 16 Fan tachometer inputs.

  There can be up to 8 fans supported. Each fan can have 1 PWM output and
  1-2 Fan tach inputs.

properties:
  compatible:
    enum:
      - aspeed,ast2400-pwm-tacho
      - aspeed,ast2500-pwm-tacho

  reg:
    maxItems: 1

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

  '#cooling-cells':
    const: 2

  clocks:
    maxItems: 1

  resets:
    maxItems: 1

patternProperties:
  '^fan@[0-7]$':
    description: Fan subnode
    type: object
    additionalProperties: false

    properties:
      reg:
        description: PWM source port index (0 = PWM A, ..., 7 = PWM H)
        maximum: 7

      cooling-levels:
        description: PWM duty cycle values for cooling states
        $ref: /schemas/types.yaml#/definitions/uint8-array
        minItems: 1
        maxItems: 16  # Should be enough

      aspeed,fan-tach-ch:
        description: Fan tachometer input channel
        $ref: /schemas/types.yaml#/definitions/uint8-array
        minItems: 1
        maxItems: 2
        items:
          maximum: 15

    required:
      - reg

Annotation

Implementation Notes