1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C
8
9 maintainers:
10 - Nuno Sa <nuno.sa@analog.com>
11
12 description: |
13 Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C.
14
15 https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf
16
17 properties:
18 compatible:
19 enum:
20 - adi,ltc4282
21
22 reg:
23 maxItems: 1
24
25 vdd-supply: true
26
27 clocks:
28 maxItems: 1
29
30 '#clock-cells':
31 const: 0
32
33 adi,rsense-nano-ohms:
34 description: Value of the sense resistor.
35
36 adi,vin-mode-microvolt:
37 description:
38 Selects operating range for the Undervoltage, Overvoltage and Foldback
39 pins. Also for the ADC. Should be set to the nominal input voltage.
40 enum: [3300000, 5000000, 12000000, 24000000]
41 default: 12000000
42
43 adi,fet-bad-timeout-ms:
44 description:
45 From the moment a FET bad conditions is present, this property selects the
46 wait time/timeout for a FET-bad fault to be signaled. Setting this to 0,
47 disables FET bad faults to be reported.
48 default: 255
49 maximum: 255
50
51 adi,overvoltage-dividers:
52 description: |
53 Select which dividers to use for VDD Overvoltage detection. Note that
54 when the internal dividers are used the threshold is referenced to VDD.
55 The percentages in the datasheet are misleading since the actual values
56 to look for are in the "Absolute Maximum Ratings" table in the
57 "Comparator Inputs" section. In there there's a line for each of the 5%,
58 10% and 15% settings with the actual min, typical and max tolerances.
59 $ref: /schemas/types.yaml#/definitions/string
60 enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent]
61 default: external
62
63 adi,undervoltage-dividers:
64 description: |
65 Select which dividers to use for VDD Overvoltage detection. Note that
66 when the internal dividers are used the threshold is referenced to VDD.
67 The percentages in the datasheet are misleading since the actual values
68 to look for are in the "Absolute Maximum Ratings" table in the
69 "Comparator Inputs" section. In there there's a line for each of the 5%,
70 10% and 15% settings with the actual min, typical and max tolerances.
71 $ref: /schemas/types.yaml#/definitions/string
72 enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent]
73 default: external
74
75 adi,current-limit-sense-microvolt:
76 description:
77 The current limit sense voltage of the chip is adjustable between
78 12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current
79 on the load.
80 enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375]
81 default: 25000
82
83 adi,overcurrent-retry:
84 description:
85 If set, enables the chip to auto-retry 256 timer cycles after an
86 Overcurrent fault.
87 type: boolean
88
89 adi,overvoltage-retry-disable:
90 description:
91 If set, disables the chip to auto-retry 50ms after an Overvoltage fault.
92 It's enabled by default.
93 type: boolean
94
95 adi,undervoltage-retry-disable:
96 description:
97 If set, disables the chip to auto-retry 50ms after an Undervoltage fault.
98 It's enabled by default.
99 type: boolean
100
101 adi,fault-log-enable:
102 description:
103 If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written
104 to the EEPROM when a fault bit transitions high and hence, will be
105 available after a power cycle (the chip loads the contents of
106 the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot).
107 type: boolean
108
109 adi,gpio1-mode:
110 description: Defines the function of the Pin. It can indicate that power is
111 good (PULL the pin low when power is not good) or that power is bad (Go
112 into high-z when power is not good).
113 $ref: /schemas/types.yaml#/definitions/string
114 enum: [power_bad, power_good]
115 default: power_good
116
117 adi,gpio2-mode:
118 description: Defines the function of the Pin. It can be set as the input for
119 the ADC or indicating that the MOSFET is in stress (dissipating power).
120 $ref: /schemas/types.yaml#/definitions/string
121 enum: [adc_input, stress_fet]
122 default: adc_input
123
124 adi,gpio3-monitor-enable:
125 description: If set, gpio3 is set as input for the ADC instead of gpio2.
126 type: boolean
127
128 allOf:
129 - if:
130 required:
131 - adi,gpio3-monitor-enable
132 then:
133 properties:
134 adi,gpio2-mode:
135 const: stress_fet
136
137 required:
138 - compatible
139 - reg
140 - adi,rsense-nano-ohms
141
142 additionalProperties: false
143
144 examples:
145 - |
146 i2c {
147 #address-cells = <1>;
148 #size-cells = <0>;
149
150 hwmon@50 {
151 compatible = "adi,ltc4282";
152 reg = <0x50>;
153 adi,rsense-nano-ohms = <500>;
154
155 adi,gpio1-mode = "power_good";
156 adi,gpio2-mode = "adc_input";
157 };
158 };
159 ...
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