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