1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-C 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/hwmon/gpio- 4 $id: http://devicetree.org/schemas/hwmon/gpio-fan.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: Fan connected to GPIO lines 7 title: Fan connected to GPIO lines
8 8
9 maintainers: 9 maintainers:
10 - Rob Herring <robh@kernel.org> 10 - Rob Herring <robh@kernel.org>
11 11
12 properties: 12 properties:
13 compatible: 13 compatible:
14 const: gpio-fan 14 const: gpio-fan
15 15
16 gpios: 16 gpios:
17 description: | 17 description: |
18 Specifies the pins that map to bits in t 18 Specifies the pins that map to bits in the control value,
19 ordered MSB-->LSB. 19 ordered MSB-->LSB.
20 minItems: 1 20 minItems: 1
21 maxItems: 7 21 maxItems: 7
22 22
23 alarm-gpios: 23 alarm-gpios:
24 maxItems: 1 24 maxItems: 1
25 25
26 gpio-fan,speed-map: 26 gpio-fan,speed-map:
27 $ref: /schemas/types.yaml#/definitions/uin 27 $ref: /schemas/types.yaml#/definitions/uint32-matrix
28 minItems: 2 28 minItems: 2
29 maxItems: 127 29 maxItems: 127
30 items: 30 items:
31 items: 31 items:
32 - description: fan speed in RPMs 32 - description: fan speed in RPMs
33 - description: control value 33 - description: control value
34 description: | 34 description: |
35 A mapping of possible fan RPM speeds and 35 A mapping of possible fan RPM speeds and the
36 control value that should be set to achi 36 control value that should be set to achieve them. This array
37 must have the RPM values in ascending or 37 must have the RPM values in ascending order.
38 38
39 '#cooling-cells': 39 '#cooling-cells':
40 const: 2 40 const: 2
41 41
42 required: 42 required:
43 - compatible 43 - compatible
44 - gpios 44 - gpios
45 - gpio-fan,speed-map 45 - gpio-fan,speed-map
46 46
47 additionalProperties: false 47 additionalProperties: false
48 48
49 examples: 49 examples:
50 - | 50 - |
51 gpio-fan { 51 gpio-fan {
52 compatible = "gpio-fan"; 52 compatible = "gpio-fan";
53 gpios = <&gpio2 14 1 53 gpios = <&gpio2 14 1
54 &gpio2 13 1>; 54 &gpio2 13 1>;
55 gpio-fan,speed-map = < 0 0>, 55 gpio-fan,speed-map = < 0 0>,
56 <3000 1>, 56 <3000 1>,
57 <6000 2>; 57 <6000 2>;
58 alarm-gpios = <&gpio2 15 1>; 58 alarm-gpios = <&gpio2 15 1>;
59 #cooling-cells = <2>; /* min followed by 59 #cooling-cells = <2>; /* min followed by max */
60 }; 60 };
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