1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/hwmon/gmt,g762.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: GMT G761/G762/G763 PWM Fan controller
8
9 maintainers:
10 - Christian Marangi <ansuelsmth@gmail.com>
11
12 description: |
13 GMT G761/G762/G763 PWM Fan controller.
14
15 G761 supports an internal-clock hence the clocks property is optional.
16 If not defined, internal-clock will be used. (31KHz is the clock of
17 the internal crystal oscillator)
18
19 If an optional property is not set in DT, then current value is kept
20 unmodified (e.g. bootloader installed value).
21
22 Additional information on operational parameters for the device is available
23 in Documentation/hwmon/g762.rst. A detailed datasheet for the device is available
24 at http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf.
25
26 properties:
27 compatible:
28 enum:
29 - gmt,g761
30 - gmt,g762
31 - gmt,g763
32
33 reg:
34 maxItems: 1
35
36 clocks:
37 description: a fixed clock providing input clock frequency on CLK
38 pin of the chip.
39 maxItems: 1
40
41 fan_startv:
42 description: Fan startup voltage step
43 $ref: /schemas/types.yaml#/definitions/uint32
44 enum: [0, 1, 2, 3]
45
46 pwm_polarity:
47 description: PWM polarity (positive or negative duty)
48 $ref: /schemas/types.yaml#/definitions/uint32
49 enum: [0, 1]
50
51 fan_gear_mode:
52 description: FAN gear mode. Configure High speed fan setting factor
53 $ref: /schemas/types.yaml#/definitions/uint32
54 enum: [0, 1, 2]
55
56 required:
57 - compatible
58 - reg
59
60 if:
61 properties:
62 compatible:
63 contains:
64 enum:
65 - gmt,g762
66 - gmt,g763
67 then:
68 required:
69 - clocks
70
71 additionalProperties: false
72
73 examples:
74 - |
75 i2c {
76 #address-cells = <1>;
77 #size-cells = <0>;
78
79 g762@3e {
80 compatible = "gmt,g762";
81 reg = <0x3e>;
82 clocks = <&g762_clk>;
83 fan_gear_mode = <0>;
84 fan_startv = <1>;
85 pwm_polarity = <0>;
86 };
87
88 g761@1e {
89 compatible = "gmt,g761";
90 reg = <0x1e>;
91 fan_gear_mode = <0>;
92 fan_startv = <1>;
93 pwm_polarity = <0>;
94 };
95 };
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