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| 1 | +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | +%YAML 1.2 |
| 3 | +--- |
| 4 | +$id: http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml# |
| 5 | +$schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | + |
| 7 | +title: Maxim MAX34408/MAX34409 current monitors with overcurrent control |
| 8 | + |
| 9 | +maintainers: |
| 10 | + - Ivan Mikhaylov <fr0st61te@gmail.com> |
| 11 | + |
| 12 | +description: | |
| 13 | + The MAX34408/MAX34409 are two- and four-channel current monitors that are |
| 14 | + configured and monitored with a standard I2C/SMBus serial interface. Each |
| 15 | + unidirectional current sensor offers precision high-side operation with a |
| 16 | + low full-scale sense voltage. The devices automatically sequence through |
| 17 | + two or four channels and collect the current-sense samples and average them |
| 18 | + to reduce the effect of impulse noise. The raw ADC samples are compared to |
| 19 | + user-programmable digital thresholds to indicate overcurrent conditions. |
| 20 | + Overcurrent conditions trigger a hardware output to provide an immediate |
| 21 | + indication to shut down any necessary external circuitry. |
| 22 | +
|
| 23 | + Specifications about the devices can be found at: |
| 24 | + https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf |
| 25 | +
|
| 26 | +properties: |
| 27 | + compatible: |
| 28 | + enum: |
| 29 | + - maxim,max34408 |
| 30 | + - maxim,max34409 |
| 31 | + |
| 32 | + "#address-cells": |
| 33 | + const: 1 |
| 34 | + |
| 35 | + "#size-cells": |
| 36 | + const: 0 |
| 37 | + |
| 38 | + reg: |
| 39 | + maxItems: 1 |
| 40 | + |
| 41 | + interrupts: |
| 42 | + maxItems: 1 |
| 43 | + |
| 44 | + powerdown-gpios: |
| 45 | + description: |
| 46 | + Shutdown Output. Open-drain output. This output transitions to high impedance |
| 47 | + when any of the digital comparator thresholds are exceeded as long as the ENA |
| 48 | + pin is high. |
| 49 | + maxItems: 1 |
| 50 | + |
| 51 | + powerdown-status-gpios: |
| 52 | + description: |
| 53 | + SHTDN Enable Input. CMOS digital input. Connect to GND to clear the latch and |
| 54 | + unconditionally deassert (force low) the SHTDN output and reset the shutdown |
| 55 | + delay. Connect to VDD to enable normal latch operation of the SHTDN output. |
| 56 | + maxItems: 1 |
| 57 | + |
| 58 | + vdd-supply: true |
| 59 | + |
| 60 | +patternProperties: |
| 61 | + "^channel@[0-3]$": |
| 62 | + $ref: adc.yaml |
| 63 | + type: object |
| 64 | + description: |
| 65 | + Represents the internal channels of the ADC. |
| 66 | + |
| 67 | + properties: |
| 68 | + reg: |
| 69 | + items: |
| 70 | + - minimum: 0 |
| 71 | + maximum: 3 |
| 72 | + |
| 73 | + maxim,rsense-val-micro-ohms: |
| 74 | + description: |
| 75 | + Adjust the Rsense value to monitor higher or lower current levels for |
| 76 | + input. |
| 77 | + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] |
| 78 | + default: 1000 |
| 79 | + |
| 80 | + required: |
| 81 | + - reg |
| 82 | + - maxim,rsense-val-micro-ohms |
| 83 | + |
| 84 | + unevaluatedProperties: false |
| 85 | + |
| 86 | +required: |
| 87 | + - compatible |
| 88 | + - reg |
| 89 | + |
| 90 | +allOf: |
| 91 | + - if: |
| 92 | + properties: |
| 93 | + compatible: |
| 94 | + contains: |
| 95 | + const: maxim,max34408 |
| 96 | + then: |
| 97 | + patternProperties: |
| 98 | + "^channel@[2-3]$": false |
| 99 | + "^channel@[0-1]$": |
| 100 | + properties: |
| 101 | + reg: |
| 102 | + maximum: 1 |
| 103 | + else: |
| 104 | + patternProperties: |
| 105 | + "^channel@[0-3]$": |
| 106 | + properties: |
| 107 | + reg: |
| 108 | + maximum: 3 |
| 109 | + |
| 110 | +additionalProperties: false |
| 111 | + |
| 112 | +examples: |
| 113 | + - | |
| 114 | + #include <dt-bindings/gpio/gpio.h> |
| 115 | +
|
| 116 | + i2c { |
| 117 | + #address-cells = <1>; |
| 118 | + #size-cells = <0>; |
| 119 | +
|
| 120 | + adc@1e { |
| 121 | + compatible = "maxim,max34409"; |
| 122 | + reg = <0x1e>; |
| 123 | + powerdown-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>; |
| 124 | + powerdown-status-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>; |
| 125 | +
|
| 126 | + #address-cells = <1>; |
| 127 | + #size-cells = <0>; |
| 128 | +
|
| 129 | + channel@0 { |
| 130 | + reg = <0x0>; |
| 131 | + maxim,rsense-val-micro-ohms = <5000>; |
| 132 | + }; |
| 133 | +
|
| 134 | + channel@1 { |
| 135 | + reg = <0x1>; |
| 136 | + maxim,rsense-val-micro-ohms = <10000>; |
| 137 | + }; |
| 138 | + }; |
| 139 | + }; |
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