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hwmon: pmbus: add driver for ltp8800-1a, ltp8800-4a, and ltp8800-2
LTP8800-1A 150A DC/DC µModule Regulator with PMBus Interface LTP8800-4A 200A DC/DC µModule Regulator with PMBus Interface LTP8800-2 54V, 135A DC/DC μModule Regulator with PMBus Interface Signed-off-by: Cedric Encarnacion <cedricjustine.encarnacion@analog.com>
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‎Documentation/hwmon/index.rst‎

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@@ -122,6 +122,7 @@ Hardware Monitoring Kernel Drivers
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ltc4245
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ltc4260
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ltc4261
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ltp8800
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max127
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max15301
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max16064

‎Documentation/hwmon/ltp8800.rst‎

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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver ltp8800
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=====================
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Supported chips:
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* Analog Devices LTP8800-1A
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Prefix: 'ltp8800-1a'
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Addresses scanned: I2C 0x40 - 0x4F
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-1a.pdf
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* Analog Devices LTP8800-4A
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Prefix: 'ltp8800-4a'
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Addresses scanned: I2C 0x40 - 0x4F
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-4a.pdf
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* Analog Devices LTP8800-2
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Prefix: 'ltp8800-2'
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Addresses scanned: I2C 0x40 - 0x4F
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Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-2.pdf
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Authors:
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- Cedric Encarnacion <cedricjustine.encarnacion@analog.com>
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Description
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-----------
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The LTP8800 is a family of step-down μModule regulators that provides
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microprocessor core voltage from 54V power distribution architecture. LTP8800
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features telemetry monitoring of input/output voltage, input current, output
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power, and temperature over PMBus.
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The driver is a client driver to the core PMBus driver. Please see
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Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
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Usage Notes
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-----------
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This driver does not auto-detect devices. You will have to instantiate the
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devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
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details.
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Platform data support
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---------------------
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The driver supports standard PMBus driver platform data. Please see
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Documentation/hwmon/pmbus.rst for details.
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Sysfs Attributes
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----------------
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======================= ===========================
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curr1_label "iin"
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curr1_input Measured input current
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curr1_crit Critical maximum current
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curr1_crit_alarm Current critical high alarm
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curr2_label "iout1"
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curr2_input Measured output current
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curr2_lcrit Critical minimum current
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curr2_crit Critical maximum current
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curr2_max Maximum output current
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curr2_alarm Current alarm
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in1_label "vin"
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in1_input Measured input voltage
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in1_lcrit Critical minimum input voltage
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in1_lcrit_alarm Input voltage critical low alarm
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in1_crit Critical maximum input voltage
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in1_crit_alarm Input voltage critical high alarm
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in2_label "vout1"
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in2_input Measured output voltage
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in2_lcrit Critical minimum output voltage
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in2_lcrit_alarm Output voltage critical low alarm
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in2_crit Critical maximum output voltage
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in2_crit_alarm Output voltage critical high alarm
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in2_max Maximum output voltage
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in2_max_alarm Output voltage high alarm
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in2_min Minimum output voltage
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in2_min_alarm Output voltage low alarm
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power1_label "pout1"
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power1_input Measured output power
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power1_crit Critical maximum output power
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temp1_input Measured temperature
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temp1_lcrit Critical low temperature
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temp1_lcrit_alarm Chip temperature critical low alarm
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temp1_crit Critical high temperature
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temp1_crit_alarm Chiptemperature critical high alarm
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======================= ===========================

‎MAINTAINERS‎

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M: Cedric Encarnacion <cedricjustine.encarnacion@analog.com>
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L: linux-hwmon@vger.kernel.org
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S: Supported
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F: Documentation/hwmon/ltp8800.rst
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F: drivers/hwmon/pmbus/ltp8800.c
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LYNX 28G SERDES PHY DRIVER
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M: Ioana Ciornei <ioana.ciornei@nxp.com>

‎drivers/hwmon/pmbus/Kconfig‎

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This driver can also be built as a module. If so, the module will
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be called ltc3815.
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config SENSORS_LTP8800
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tristate "Analog Devices LTP8800 and compatibles"
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help
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If you say yes here you get hardware monitoring support for Analog
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Devices LTP8800-1A, LTP8800-4A, and LTP8800-2.
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This driver can also be built as a module. If so, the module will
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be called ltp8800.
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config SENSORS_LTP8800_REGULATOR
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bool "Regulator support for LTP8800 and compatibles"
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depends on SENSORS_LTP8800 && REGULATOR
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help
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If you say yes here you get regulator support for Analog Devices
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LTP8800-1A, LTP8800-4A, and LTP8800-2. LTP8800 is a family of DC/DC
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µModule regulators that can provide microprocessor power from 54V
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power distribution architecture.
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config SENSORS_MAX15301
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tristate "Maxim MAX15301"
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help

‎drivers/hwmon/pmbus/Makefile‎

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obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o
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obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
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obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
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obj-$(CONFIG_SENSORS_LTP8800) += ltp8800.o
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obj-$(CONFIG_SENSORS_MAX15301) += max15301.o
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obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
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obj-$(CONFIG_SENSORS_MAX16601) += max16601.o

‎drivers/hwmon/pmbus/ltp8800.c‎

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// SPDX-License-Identifier: GPL-2.0
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/*
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* Hardware monitoring driver for Analog Devices LTP8800
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*
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* Copyright (C) 2024 Analog Devices, Inc.
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*/
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#include <linux/bits.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include "pmbus.h"
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static const struct regulator_desc ltp8800_reg_desc[] = {
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PMBUS_REGULATOR("vout", 0),
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};
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static struct pmbus_driver_info ltp8800_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = linear,
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.format[PSC_VOLTAGE_OUT] = linear,
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.format[PSC_CURRENT_IN] = linear,
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.format[PSC_TEMPERATURE] = linear,
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.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
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PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
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PMBUS_HAVE_POUT,
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};
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/* 6.1 requires i2c_device_id */
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static int ltp8800_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_BYTE_DATA |
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -ENODEV;
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if (IS_ENABLED(CONFIG_SENSORS_LTP8800_REGULATOR)) {
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ltp8800_info.num_regulators = 1;
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ltp8800_info.reg_desc = ltp8800_reg_desc;
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}
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return pmbus_do_probe(client, &ltp8800_info);
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}
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static const struct i2c_device_id ltp8800_id[] = {
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{"ltp8800-1a", 0},
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{"ltp8800-2", 0},
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{"ltp8800-4a", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ltp8800_id);
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static const struct of_device_id ltp8800_of_match[] = {
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{ .compatible = "adi,ltp8800-1a"},
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{ .compatible = "adi,ltp8800-2"},
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{ .compatible = "adi,ltp8800-4a"},
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{}
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};
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MODULE_DEVICE_TABLE(of, ltp8800_of_match);
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static struct i2c_driver ltp8800_driver = {
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.driver = {
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.name = "ltp8800",
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.of_match_table = ltp8800_of_match,
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},
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.probe = ltp8800_probe,
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.id_table = ltp8800_id,
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};
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module_i2c_driver(ltp8800_driver);
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MODULE_AUTHOR("Cedric Encarnacion <cedricjustine.encarnacion@analog.com>");
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MODULE_DESCRIPTION("Analog Devices LTP8800 HWMON PMBus Driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);

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