# 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
      - aspeed,fan-tach-ch

required:
  - compatible
  - reg
  - '#address-cells'
  - '#size-cells'
  - clocks
  - resets

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/aspeed-clock.h>
 
    fan-controller@1e786000 {
        compatible = "aspeed,ast2500-pwm-tacho";
        reg = <0x1e786000 0x1000>;
        #address-cells = <1>;
        #size-cells = <0>;
        #cooling-cells = <2>;
        clocks = <&syscon ASPEED_CLK_APB>;
        resets = <&syscon ASPEED_RESET_PWM>;
 
        fan@0 {
            reg = <0x00>;
            cooling-levels = /bits/ 8 <125 151 177 203 229 255>;
            aspeed,fan-tach-ch = /bits/ 8 <0x00>;
        };
 
        fan@1 {
            reg = <0x01>;
            aspeed,fan-tach-ch = /bits/ 8 <0x01 0x02>;
        };
    };