| # 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>; |
| }; |
| }; |
