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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C
maintainers:
- Nuno Sa <nuno.sa@analog.com>
description: |
Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C.
https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf
properties:
compatible:
enum:
- adi,ltc4282
reg:
maxItems: 1
vdd-supply: true
clocks:
maxItems: 1
'#clock-cells':
const: 0
adi,rsense-nano-ohms:
description: Value of the sense resistor.
adi,vin-mode-microvolt:
description:
Selects operating range for the Undervoltage, Overvoltage and Foldback
pins. Also for the ADC. Should be set to the nominal input voltage.
enum: [3300000, 5000000, 12000000, 24000000]
default: 12000000
adi,fet-bad-timeout-ms:
description:
From the moment a FET bad conditions is present, this property selects the
wait time/timeout for a FET-bad fault to be signaled. Setting this to 0,
disables FET bad faults to be reported.
default: 255
maximum: 255
adi,overvoltage-dividers:
description: |
Select which dividers to use for VDD Overvoltage detection. Note that
when the internal dividers are used the threshold is referenced to VDD.
The percentages in the datasheet are misleading since the actual values
to look for are in the "Absolute Maximum Ratings" table in the
"Comparator Inputs" section. In there there's a line for each of the 5%,
10% and 15% settings with the actual min, typical and max tolerances.
$ref: /schemas/types.yaml#/definitions/string
enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent]
default: external
adi,undervoltage-dividers:
description: |
Select which dividers to use for VDD Overvoltage detection. Note that
when the internal dividers are used the threshold is referenced to VDD.
The percentages in the datasheet are misleading since the actual values
to look for are in the "Absolute Maximum Ratings" table in the
"Comparator Inputs" section. In there there's a line for each of the 5%,
10% and 15% settings with the actual min, typical and max tolerances.
$ref: /schemas/types.yaml#/definitions/string
enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent]
default: external
adi,current-limit-sense-microvolt:
description:
The current limit sense voltage of the chip is adjustable between
12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current
on the load.
enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375]
default: 25000
adi,overcurrent-retry:
description:
If set, enables the chip to auto-retry 256 timer cycles after an
Overcurrent fault.
type: boolean
adi,overvoltage-retry-disable:
description:
If set, disables the chip to auto-retry 50ms after an Overvoltage fault.
It's enabled by default.
type: boolean
adi,undervoltage-retry-disable:
description:
If set, disables the chip to auto-retry 50ms after an Undervoltage fault.
It's enabled by default.
type: boolean
adi,fault-log-enable:
description:
If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written
to the EEPROM when a fault bit transitions high and hence, will be
available after a power cycle (the chip loads the contents of
the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot).
type: boolean
adi,gpio1-mode:
description: Defines the function of the Pin. It can indicate that power is
good (PULL the pin low when power is not good) or that power is bad (Go
into high-z when power is not good).
$ref: /schemas/types.yaml#/definitions/string
enum: [power_bad, power_good]
default: power_good
adi,gpio2-mode:
description: Defines the function of the Pin. It can be set as the input for
the ADC or indicating that the MOSFET is in stress (dissipating power).
$ref: /schemas/types.yaml#/definitions/string
enum: [adc_input, stress_fet]
default: adc_input
adi,gpio3-monitor-enable:
description: If set, gpio3 is set as input for the ADC instead of gpio2.
type: boolean
allOf:
- if:
required:
- adi,gpio3-monitor-enable
then:
properties:
adi,gpio2-mode:
const: stress_fet
required:
- compatible
- reg
- adi,rsense-nano-ohms
additionalProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
hwmon@50 {
compatible = "adi,ltc4282";
reg = <0x50>;
adi,rsense-nano-ohms = <500>;
adi,gpio1-mode = "power_good";
adi,gpio2-mode = "adc_input";
};
};
...
|
