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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/hwmon/microchip,emc2305.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/microchip,emc2305.yaml#

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

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title: Microchip EMC2305 SMBus compliant PWM fan controller

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maintainers:

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  - Michael Shych <michaelsh@nvidia.com>

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description:

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  Microchip EMC2301/2/3/5 pwm controller which supports up to five programmable

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  fan control circuits.

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properties:

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  compatible:

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    oneOf:

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      - enum:

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          - microchip,emc2305

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      - items:

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          - enum:

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              - microchip,emc2303

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              - microchip,emc2302

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              - microchip,emc2301

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          - const: microchip,emc2305

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  reg:

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    maxItems: 1

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  '#address-cells':

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    const: 1

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  '#size-cells':

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    const: 0

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  '#pwm-cells':

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    const: 3

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    description: |

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      Number of cells in a PWM specifier.

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      - cell 0: The PWM frequency

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      - cell 1: The PWM polarity: 0 or PWM_POLARITY_INVERTED

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      - cell 2: The PWM output config:

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           - 0 (Open-Drain)

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           - 1 (Push-Pull)

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patternProperties:

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  '^fan@[0-4]$':

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    $ref: fan-common.yaml#

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    unevaluatedProperties: false

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    properties:

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      reg:

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        description:

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          The fan number used to determine the associated PWM channel.

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        maxItems: 1

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    required:

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      - reg

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required:

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  - compatible

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  - reg

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additionalProperties: false

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examples:

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  - |

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    #include <dt-bindings/pwm/pwm.h>

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    i2c {

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        #address-cells = <1>;

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        #size-cells = <0>;

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        fan_controller: fan-controller@2f {

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            compatible = "microchip,emc2305";

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            reg = <0x2f>;

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            #address-cells = <1>;

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            #size-cells = <0>;

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            #pwm-cells = <3>;

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            fan@0 {

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                reg = <0x0>;

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                pwms = <&fan_controller 26000 PWM_POLARITY_INVERTED 1>;

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                #cooling-cells = <2>;

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            };

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            fan@1 {

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                reg = <0x1>;

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                pwms = <&fan_controller 26000 0 1>;

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                #cooling-cells = <2>;

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            };

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            fan@2 {

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                reg = <0x2>;

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                pwms = <&fan_controller 26000 0 1>;

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                #cooling-cells = <2>;

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            };

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            fan@3 {

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                reg = <0x3>;

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                pwms = <&fan_controller 26000 0 1>;

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                #cooling-cells = <2>;

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            };

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            fan@4 {

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                reg = <0x4>;

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                pwms = <&fan_controller 26000 0 1>;

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                #cooling-cells = <2>;

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            };

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        };

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    };

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...

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