diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 8459b8a590609d..0827ba6d7e7d47 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -122,6 +122,7 @@ Hardware Monitoring Kernel Drivers ltc4245 ltc4260 ltc4261 + ltp8800 max127 max15301 max16064 diff --git a/Documentation/hwmon/ltp8800.rst b/Documentation/hwmon/ltp8800.rst new file mode 100644 index 00000000000000..8fdc7b29505433 --- /dev/null +++ b/Documentation/hwmon/ltp8800.rst @@ -0,0 +1,103 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver ltp8800 +===================== + +Supported chips: + + * Analog Devices LTP8800-1A + + Prefix: 'ltp8800-1a' + + Addresses scanned: I2C 0x40 - 0x4F + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-1a.pdf + + * Analog Devices LTP8800-4A + + Prefix: 'ltp8800-4a' + + Addresses scanned: I2C 0x40 - 0x4F + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-4a.pdf + + * Analog Devices LTP8800-2 + + Prefix: 'ltp8800-2' + + Addresses scanned: I2C 0x40 - 0x4F + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltp8800-2.pdf + +Authors: + - Cedric Encarnacion + + +Description +----------- + +The LTP8800 is a family of step-down μModule regulators that provides +microprocessor core voltage from 54V power distribution architecture. LTP8800 +features telemetry monitoring of input/output voltage, input current, output +power, and temperature over PMBus. + +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 +details. + +Platform data support +--------------------- + +The driver supports standard PMBus driver platform data. Please see +Documentation/hwmon/pmbus.rst for details. + +Sysfs Attributes +---------------- + +======================= =========================== +curr1_label "iin" +curr1_input Measured input current +curr1_crit Critical maximum current +curr1_crit_alarm Current critical high alarm + +curr2_label "iout1" +curr2_input Measured output current +curr2_lcrit Critical minimum current +curr2_crit Critical maximum current +curr2_max Maximum output current +curr2_alarm Current alarm + +in1_label "vin" +in1_input Measured input voltage +in1_lcrit Critical minimum input voltage +in1_lcrit_alarm Input voltage critical low alarm +in1_crit Critical maximum input voltage +in1_crit_alarm Input voltage critical high alarm + +in2_label "vout1" +in2_input Measured output voltage +in2_lcrit Critical minimum output voltage +in2_lcrit_alarm Output voltage critical low alarm +in2_crit Critical maximum output voltage +in2_crit_alarm Output voltage critical high alarm +in2_max Maximum output voltage +in2_max_alarm Output voltage high alarm +in2_min Minimum output voltage +in2_min_alarm Output voltage low alarm + +power1_label "pout1" +power1_input Measured output power +power1_crit Critical maximum output power + +temp1_input Measured temperature +temp1_lcrit Critical low temperature +temp1_lcrit_alarm Chip temperature critical low alarm +temp1_crit Critical high temperature +temp1_crit_alarm Chiptemperature critical high alarm +======================= =========================== diff --git a/MAINTAINERS b/MAINTAINERS index bbbacc982cdd78..892dcd41cb9c40 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12260,6 +12260,8 @@ M: Cedric Encarnacion L: linux-hwmon@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/hwmon/pmbus/adi,ltp8800.yaml +F: Documentation/hwmon/ltp8800.rst +F: drivers/hwmon/pmbus/ltp8800.c LYNX 28G SERDES PHY DRIVER M: Ioana Ciornei diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index e92ecd672c00ef..1fb311401f1eb3 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -228,6 +228,24 @@ config SENSORS_LTC3815 This driver can also be built as a module. If so, the module will be called ltc3815. +config SENSORS_LTP8800 + tristate "Analog Devices LTP8800 and compatibles" + help + If you say yes here you get hardware monitoring support for Analog + Devices LTP8800-1A, LTP8800-4A, and LTP8800-2. + + This driver can also be built as a module. If so, the module will + be called ltp8800. + +config SENSORS_LTP8800_REGULATOR + bool "Regulator support for LTP8800 and compatibles" + depends on SENSORS_LTP8800 && REGULATOR + help + If you say yes here you get regulator support for Analog Devices + LTP8800-1A, LTP8800-4A, and LTP8800-2. LTP8800 is a family of DC/DC + µModule regulators that can provide microprocessor power from 54V + power distribution architecture. + config SENSORS_MAX15301 tristate "Maxim MAX15301" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index dc76b70421d2f8..2ea2a4ac694f1f 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_LM25066) += lm25066.o obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o +obj-$(CONFIG_SENSORS_LTP8800) += ltp8800.o obj-$(CONFIG_SENSORS_MAX15301) += max15301.o obj-$(CONFIG_SENSORS_MAX16064) += max16064.o obj-$(CONFIG_SENSORS_MAX16601) += max16601.o diff --git a/drivers/hwmon/pmbus/ltp8800.c b/drivers/hwmon/pmbus/ltp8800.c new file mode 100644 index 00000000000000..d09f7d5b2b235b --- /dev/null +++ b/drivers/hwmon/pmbus/ltp8800.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hardware monitoring driver for Analog Devices LTP8800 + * + * Copyright (C) 2024 Analog Devices, Inc. + */ +#include +#include +#include +#include +#include "pmbus.h" + +static const struct regulator_desc ltp8800_reg_desc[] = { + PMBUS_REGULATOR("vout", 0), +}; + +static struct pmbus_driver_info ltp8800_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = linear, + .format[PSC_CURRENT_IN] = linear, + .format[PSC_TEMPERATURE] = linear, + .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | + PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | + PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | + PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_POUT, +}; + +/* 6.1 requires i2c_device_id */ +static int ltp8800_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE_DATA | + I2C_FUNC_SMBUS_READ_WORD_DATA)) + return -ENODEV; + + if (IS_ENABLED(CONFIG_SENSORS_LTP8800_REGULATOR)) { + ltp8800_info.num_regulators = 1; + ltp8800_info.ltp8800_reg_desc = ltp8800_reg_desc; + } + + return pmbus_do_probe(client, <p8800_info); +} + +static const struct i2c_device_id ltp8800_id[] = { + {"ltp8800-1a", 0}, + {"ltp8800-4a", 0}, + {"ltp8800-2", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, ltp8800_id); + +static const struct of_device_id ltp8800_of_match[] = { + { .compatible = "adi,ltp8800-1a"}, + { .compatible = "adi,ltp8800-4a"}, + { .compatible = "adi,ltp8800-2"}, + {} +}; +MODULE_DEVICE_TABLE(of, ltp8800_of_match); + +static struct i2c_driver ltp8800_driver = { + .driver = { + .name = "ltp8800", + .of_match_table = ltp8800_of_match, + }, + .probe = ltp8800_probe, + .id_table = ltp8800_id, +}; +module_i2c_driver(ltp8800_driver); + +MODULE_AUTHOR("Cedric Encarnacion "); +MODULE_DESCRIPTION("Analog Devices LTP8800 HWMON PMBus Driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS);