blob: 2cd149676d86363cdbd2a16aa9a134fa79c16141 [file] [log] [blame]
.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver ltc4286
Supported chips:
* Analog Devices LTC4286
Prefix: 'ltc4286'
Addresses scanned: -
* Analog Devices LTC4287
Prefix: 'ltc4287'
Addresses scanned: -
Author: Delphine CC Chiu <>
This driver supports hardware monitoring for Analog Devices LTC4286
and LTC4287 Hot-Swap Controller and Digital Power Monitors.
LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board
to be removed from or inserted into a live backplane. They also feature
current and voltage readback via an integrated 12 bit analog-to-digital
converter (ADC), accessed using a PMBus interface.
The driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
Usage Notes
This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
The shunt value in micro-ohms can be set via device tree at compile-time. Please
refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings
if the device tree is used.
Platform data support
The driver supports standard PMBus driver platform data. Please see
Documentation/hwmon/pmbus.rst for details.
Sysfs entries
The following attributes are supported. Limits are read-write, history reset
attributes are write-only, all other attributes are read-only.
======================= =======================================================
in1_label "vin"
in1_input Measured voltage.
in1_alarm Input voltage alarm.
in1_min Minimum input voltage.
in1_max Maximum input voltage.
in2_label "vout1"
in2_input Measured voltage.
in2_alarm Output voltage alarm.
in2_min Minimum output voltage.
in2_max Maximum output voltage.
curr1_label "iout1"
curr1_input Measured current.
curr1_alarm Output current alarm.
curr1_max Maximum current.
power1_label "pin"
power1_input Input power.
power1_alarm Input power alarm.
power1_max Maximum poewr.
temp1_input Chip temperature.
temp1_min Minimum chip temperature.
temp1_max Maximum chip temperature.
temp1_crit Critical chip temperature.
temp1_alarm Chip temperature alarm.
======================= =======================================================