98 lines
2.3 KiB
YAML
98 lines
2.3 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/hwmon/pwm-fan.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Fan connected to PWM lines
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maintainers:
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- Jean Delvare <jdelvare@suse.com>
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- Guenter Roeck <linux@roeck-us.net>
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properties:
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compatible:
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const: pwm-fan
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cooling-levels:
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description: PWM duty cycle values corresponding to thermal cooling states.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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items:
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maximum: 255
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fan-supply:
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description: Phandle to the regulator that provides power to the fan.
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interrupts:
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description:
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This contains an interrupt specifier for each fan tachometer output
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connected to an interrupt source. The output signal must generate a
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defined number of interrupts per fan revolution, which require that
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it must be self resetting edge interrupts.
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maxItems: 1
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pulses-per-revolution:
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description:
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Define the number of pulses per fan revolution for each tachometer
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input as an integer.
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$ref: /schemas/types.yaml#/definitions/uint32
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minimum: 1
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maximum: 4
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default: 2
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pwms:
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description: The PWM that is used to control the fan.
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maxItems: 1
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"#cooling-cells": true
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required:
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- compatible
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- pwms
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additionalProperties: false
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examples:
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- |
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pwm-fan {
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compatible = "pwm-fan";
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cooling-levels = <0 102 170 230>;
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pwms = <&pwm 0 10000 0>;
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#cooling-cells = <2>;
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};
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thermal-zones {
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cpu_thermal: cpu-thermal {
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thermal-sensors = <&tmu 0>;
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polling-delay-passive = <0>;
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polling-delay = <0>;
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trips {
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cpu_alert1: cpu-alert1 {
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temperature = <100000>; /* millicelsius */
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hysteresis = <2000>; /* millicelsius */
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type = "passive";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu_alert1>;
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cooling-device = <&fan0 0 1>;
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};
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};
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};
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};
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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pwm-fan {
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compatible = "pwm-fan";
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pwms = <&pwm 0 40000 0>;
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fan-supply = <®_fan>;
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interrupt-parent = <&gpio5>;
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interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
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pulses-per-revolution = <2>;
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};
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