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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/hwmon/gpio-fan.yaml
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# SPDX-License-Identifier: (GPL-2.0 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/gpio-fan.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: Fan connected to GPIO lines

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maintainers:

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  - Rob Herring <robh@kernel.org>

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properties:

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  compatible:

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    const: gpio-fan

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  gpios:

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    description: |

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      Specifies the pins that map to bits in the control value,

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      ordered MSB-->LSB.

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    minItems: 1

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    maxItems: 7

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  alarm-gpios:

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    maxItems: 1

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  fan-supply:

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    description: Power supply for fan

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  gpio-fan,speed-map:

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    $ref: /schemas/types.yaml#/definitions/uint32-matrix

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    minItems: 2

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    maxItems: 127

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    items:

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      items:

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        - description: fan speed in RPMs

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        - description: control value

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    description: |

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      A mapping of possible fan RPM speeds and the

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      control value that should be set to achieve them. This array

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      must have the RPM values in ascending order.

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  '#cooling-cells':

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    const: 2

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required:

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  - compatible

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  - gpios

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  - gpio-fan,speed-map

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additionalProperties: false

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examples:

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  - |

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    gpio-fan {

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      compatible = "gpio-fan";

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      gpios = <&gpio2 14 1

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               &gpio2 13 1>;

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      gpio-fan,speed-map = <   0 0>,

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                           <3000 1>,

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                           <6000 2>;

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      alarm-gpios = <&gpio2 15 1>;

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      #cooling-cells = <2>; /* min followed by max */

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    };

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