| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/hwmon/pwm-fan.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Fan connected to PWM lines |
| 8 | |
| 9 | maintainers: |
| 10 | - Jean Delvare <jdelvare@suse.com> |
| 11 | - Guenter Roeck <linux@roeck-us.net> |
| 12 | |
| 13 | properties: |
| 14 | compatible: |
| 15 | const: pwm-fan |
| 16 | |
| 17 | cooling-levels: |
| 18 | description: PWM duty cycle values corresponding to thermal cooling states. |
| 19 | $ref: /schemas/types.yaml#/definitions/uint32-array |
| 20 | items: |
| 21 | maximum: 255 |
| 22 | |
| 23 | fan-supply: |
| 24 | description: Phandle to the regulator that provides power to the fan. |
| 25 | |
| 26 | interrupts: |
| 27 | description: |
| 28 | This contains an interrupt specifier for each fan tachometer output |
| 29 | connected to an interrupt source. The output signal must generate a |
| 30 | defined number of interrupts per fan revolution, which require that |
| 31 | it must be self resetting edge interrupts. |
| 32 | maxItems: 1 |
| 33 | |
| 34 | pulses-per-revolution: |
| 35 | description: |
| 36 | Define the number of pulses per fan revolution for each tachometer |
| 37 | input as an integer. |
| 38 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 39 | minimum: 1 |
| 40 | maximum: 4 |
| 41 | default: 2 |
| 42 | |
| 43 | pwms: |
| 44 | description: The PWM that is used to control the fan. |
| 45 | maxItems: 1 |
| 46 | |
| 47 | "#cooling-cells": true |
| 48 | |
| 49 | required: |
| 50 | - compatible |
| 51 | - pwms |
| 52 | |
| 53 | additionalProperties: false |
| 54 | |
| 55 | examples: |
| 56 | - | |
| 57 | pwm-fan { |
| 58 | compatible = "pwm-fan"; |
| 59 | cooling-levels = <0 102 170 230>; |
| 60 | pwms = <&pwm 0 10000 0>; |
| 61 | #cooling-cells = <2>; |
| 62 | }; |
| 63 | |
| 64 | thermal-zones { |
| 65 | cpu_thermal: cpu-thermal { |
| 66 | thermal-sensors = <&tmu 0>; |
| 67 | polling-delay-passive = <0>; |
| 68 | polling-delay = <0>; |
| 69 | |
| 70 | trips { |
| 71 | cpu_alert1: cpu-alert1 { |
| 72 | temperature = <100000>; /* millicelsius */ |
| 73 | hysteresis = <2000>; /* millicelsius */ |
| 74 | type = "passive"; |
| 75 | }; |
| 76 | }; |
| 77 | |
| 78 | cooling-maps { |
| 79 | map0 { |
| 80 | trip = <&cpu_alert1>; |
| 81 | cooling-device = <&fan0 0 1>; |
| 82 | }; |
| 83 | }; |
| 84 | }; |
| 85 | }; |
| 86 | |
| 87 | - | |
| 88 | #include <dt-bindings/interrupt-controller/irq.h> |
| 89 | |
| 90 | pwm-fan { |
| 91 | compatible = "pwm-fan"; |
| 92 | pwms = <&pwm 0 40000 0>; |
| 93 | fan-supply = <®_fan>; |
| 94 | interrupt-parent = <&gpio5>; |
| 95 | interrupts = <1 IRQ_TYPE_EDGE_FALLING>; |
| 96 | pulses-per-revolution = <2>; |
| 97 | }; |