1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/hwmon/adt7475.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: ADT7475 hwmon sensor
8
9 maintainers:
10 - Jean Delvare <jdelvare@suse.com>
11
12 description: |
13 The ADT7473, ADT7475, ADT7476, and ADT7490 are thermal monitors and multiple
14 PWN fan controllers.
15
16 They support monitoring and controlling up to four fans (the ADT7490 can only
17 control up to three). They support reading a single on chip temperature
18 sensor and two off chip temperature sensors (the ADT7490 additionally
19 supports measuring up to three current external temperature sensors with
20 series resistance cancellation (SRC)).
21
22 Datasheets:
23 https://www.onsemi.com/pub/Collateral/ADT7473-D.PDF
24 https://www.onsemi.com/pub/Collateral/ADT7475-D.PDF
25 https://www.onsemi.com/pub/Collateral/ADT7476-D.PDF
26 https://www.onsemi.com/pub/Collateral/ADT7490-D.PDF
27
28 Description taken from onsemiconductors specification sheets, with minor
29 rephrasing.
30
31 properties:
32 compatible:
33 enum:
34 - adi,adt7473
35 - adi,adt7475
36 - adi,adt7476
37 - adi,adt7490
38
39 reg:
40 maxItems: 1
41
42 adi,pwm-active-state:
43 description: |
44 Integer array, represents the active state of the pwm outputs If set to 0
45 the pwm uses a logic low output for 100% duty cycle. If set to 1 the pwm
46 uses a logic high output for 100% duty cycle.
47 $ref: /schemas/types.yaml#/definitions/uint32-array
48 deprecated: true
49 minItems: 3
50 maxItems: 3
51 items:
52 enum: [0, 1]
53 default: 1
54
55 "#pwm-cells":
56 const: 4
57 description: |
58 Number of cells in a PWM specifier.
59 - 0: The PWM channel
60 - 1: The PWM period in nanoseconds
61 - 90909091 (11 Hz)
62 - 71428571 (14 Hz)
63 - 45454545 (22 Hz)
64 - 34482759 (29 Hz)
65 - 28571429 (35 Hz)
66 - 22727273 (44 Hz)
67 - 17241379 (58 Hz)
68 - 11363636 (88 Hz)
69 - 44444 (22 kHz)
70 - 2: PWM flags 0 or PWM_POLARITY_INVERTED
71 - 3: The default PWM duty cycle in nanoseconds
72
73 patternProperties:
74 "^adi,bypass-attenuator-in[0-4]$":
75 description: |
76 Configures bypassing the individual voltage input attenuator. If
77 set to 1 the attenuator is bypassed if set to 0 the attenuator is
78 not bypassed. If the property is absent then the attenuator
79 retains its configuration from the bios/bootloader.
80 $ref: /schemas/types.yaml#/definitions/uint32
81 enum: [0, 1]
82
83 "^adi,pin(5|10)-function$":
84 description: |
85 Configures the function for pin 5 on the adi,adt7473 and adi,adt7475. Or
86 pin 10 on the adi,adt7476 and adi,adt7490.
87 $ref: /schemas/types.yaml#/definitions/string
88 enum:
89 - pwm2
90 - smbalert#
91
92 "^adi,pin(9|14)-function$":
93 description: |
94 Configures the function for pin 9 on the adi,adt7473 and adi,adt7475. Or
95 pin 14 on the adi,adt7476 and adi,adt7490
96 $ref: /schemas/types.yaml#/definitions/string
97 enum:
98 - tach4
99 - therm#
100 - smbalert#
101 - gpio
102
103 "^fan-[0-9]+$":
104 $ref: fan-common.yaml#
105 unevaluatedProperties: false
106
107 required:
108 - compatible
109 - reg
110
111 additionalProperties: false
112
113 examples:
114 - |
115 #include <dt-bindings/pwm/pwm.h>
116 i2c {
117 #address-cells = <1>;
118 #size-cells = <0>;
119
120 pwm: hwmon@2e {
121 compatible = "adi,adt7476";
122 reg = <0x2e>;
123 adi,bypass-attenuator-in0 = <1>;
124 adi,bypass-attenuator-in1 = <0>;
125 adi,pin10-function = "smbalert#";
126 adi,pin14-function = "tach4";
127 #pwm-cells = <4>;
128
129 /* PWMs at 22.5 kHz frequency, 50% duty*/
130 fan-0 {
131 pwms = <&pwm 0 44444 0 22222>;
132 };
133
134 fan-1 {
135 pwms = <&pwm 2 44444 0 22222>;
136 };
137 };
138 };
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