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,max6639.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: Maxim max6639
9
10 maintainers:
11 - Naresh Solanki <naresh.solanki@9elements.com>
12
13 description: |
14 The MAX6639 is a 2-channel temperature monitor with dual, automatic, PWM
15 fan-speed controller. It monitors its own temperature and one external
16 diode-connected transistor or the temperatures of two external diode-connected
17 transistors, typically available in CPUs, FPGAs, or GPUs.
18
19 Datasheets:
20 https://datasheets.maximintegrated.com/en/ds/MAX6639-MAX6639F.pdf
21
22 properties:
23 compatible:
24 enum:
25 - maxim,max6639
26
27 reg:
28 maxItems: 1
29
30 '#address-cells':
31 const: 1
32
33 '#size-cells':
34 const: 0
35
36 '#pwm-cells':
37 const: 3
38
39 required:
40 - compatible
41 - reg
42
43 patternProperties:
44 "^fan@[0-1]$":
45 type: object
46 description:
47 Represents the two fans and their specific configuration.
48
49 $ref: fan-common.yaml#
50
51 unevaluatedProperties: false
52
53 properties:
54 reg:
55 description:
56 The fan number.
57
58 required:
59 - reg
60
61 additionalProperties: false
62
63 examples:
64 - |
65 i2c {
66 #address-cells = <1>;
67 #size-cells = <0>;
68
69 fan1: fan-controller@10 {
70 compatible = "maxim,max6639";
71 reg = <0x10>;
72 #address-cells = <1>;
73 #size-cells = <0>;
74 #pwm-cells = <3>;
75
76 fan@0 {
77 reg = <0x0>;
78 pulses-per-revolution = <2>;
79 max-rpm = <4000>;
80 target-rpm = <1000>;
81 pwms = <&fan1 0 25000 0>;
82 };
83
84 fan@1 {
85 reg = <0x1>;
86 pulses-per-revolution = <2>;
87 max-rpm = <8000>;
88 pwms = <&fan1 1 25000 0>;
89 };
90 };
91 };
92 ...
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