1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/hwmon/maxim,max6650.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Maxim MAX6650 and MAX6651 I2C Fan Controllers
8
9maintainers:
10  - Javier Carrasco <javier.carrasco.cruz@gmail.com>
11
12description: |
13  The MAX6650 and MAX6651 regulate and monitor the speed
14  of 5VDC/12VDC burshless fans with built-in tachometers.
15
16  Datasheets:
17    https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf
18
19properties:
20  compatible:
21    enum:
22      - maxim,max6650
23      - maxim,max6651
24
25  reg:
26    maxItems: 1
27
28  maxim,fan-microvolt:
29    description:
30      The supply voltage of the fan, either 5000000 uV or
31      12000000 uV.
32    enum: [5000000, 12000000]
33
34  maxim,fan-prescale:
35    description:
36      Pre-scaling value, as per datasheet. Lower values
37      allow more fine-grained control of slower fans.
38    $ref: /schemas/types.yaml#/definitions/uint32
39    enum: [1, 2, 4, 8, 16]
40
41  maxim,fan-target-rpm:
42    description:
43      Initial requested fan rotation speed. If specified, the
44      driver selects closed-loop mode and the requested speed.
45      This ensures the fan is already running before userspace
46      takes over.
47    $ref: /schemas/types.yaml#/definitions/uint32
48    maximum: 30000
49
50required:
51  - compatible
52  - reg
53
54additionalProperties: false
55
56examples:
57  - |
58    i2c {
59        #address-cells = <1>;
60        #size-cells = <0>;
61
62        fan-controller@1b {
63            compatible = "maxim,max6650";
64            reg = <0x1b>;
65            maxim,fan-microvolt = <12000000>;
66            maxim,fan-prescale = <4>;
67            maxim,fan-target-rpm = <1200>;
68        };
69    };
70