1.. SPDX-License-Identifier: GPL-2.0-or-later 2 3Kernel driver ltc4286 4===================== 5 6Supported chips: 7 8 * Analog Devices LTC4286 9 10 Prefix: 'ltc4286' 11 12 Addresses scanned: - 13 14 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4286.pdf 15 16 * Analog Devices LTC4287 17 18 Prefix: 'ltc4287' 19 20 Addresses scanned: - 21 22 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4287.pdf 23 24Author: Delphine CC Chiu <Delphine_CC_Chiu@Wiwynn.com> 25 26 27Description 28----------- 29 30This driver supports hardware monitoring for Analog Devices LTC4286 31and LTC4287 Hot-Swap Controller and Digital Power Monitors. 32 33LTC4286 and LTC4287 are hot-swap controllers that allow a circuit board 34to be removed from or inserted into a live backplane. They also feature 35current and voltage readback via an integrated 12 bit analog-to-digital 36converter (ADC), accessed using a PMBus interface. 37 38The driver is a client driver to the core PMBus driver. Please see 39Documentation/hwmon/pmbus.rst for details on PMBus client drivers. 40 41 42Usage Notes 43----------- 44 45This driver does not auto-detect devices. You will have to instantiate the 46devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for 47details. 48 49The shunt value in micro-ohms can be set via device tree at compile-time. Please 50refer to the Documentation/devicetree/bindings/hwmon/lltc,ltc4286.yaml for bindings 51if the device tree is used. 52 53 54Platform data support 55--------------------- 56 57The driver supports standard PMBus driver platform data. Please see 58Documentation/hwmon/pmbus.rst for details. 59 60 61Sysfs entries 62------------- 63 64The following attributes are supported. Limits are read-write, history reset 65attributes are write-only, all other attributes are read-only. 66 67======================= ======================================================= 68in1_label "vin" 69in1_input Measured voltage. 70in1_alarm Input voltage alarm. 71in1_min Minimum input voltage. 72in1_max Maximum input voltage. 73 74in2_label "vout1" 75in2_input Measured voltage. 76in2_alarm Output voltage alarm. 77in2_min Minimum output voltage. 78in2_max Maximum output voltage. 79 80curr1_label "iout1" 81curr1_input Measured current. 82curr1_alarm Output current alarm. 83curr1_max Maximum current. 84 85power1_label "pin" 86power1_input Input power. 87power1_alarm Input power alarm. 88power1_max Maximum poewr. 89 90temp1_input Chip temperature. 91temp1_min Minimum chip temperature. 92temp1_max Maximum chip temperature. 93temp1_crit Critical chip temperature. 94temp1_alarm Chip temperature alarm. 95======================= ======================================================= 96