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Thu, 16 Apr 2026 03:59:58 -0400 From: Alexis Czezar Torreno Date: Thu, 16 Apr 2026 15:59:11 +0800 Subject: [PATCH v2 2/2] hwmon: (pmbus/max20830) add driver for max20830 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260416-dev_max20830-v2-2-2c7d676dc0bd@analog.com> References: <20260416-dev_max20830-v2-0-2c7d676dc0bd@analog.com> In-Reply-To: <20260416-dev_max20830-v2-0-2c7d676dc0bd@analog.com> To: Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , Shuah Khan CC: , , , , "Alexis Czezar Torreno" X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1776326383; l=7365; i=alexisczezar.torreno@analog.com; s=20250213; h=from:subject:message-id; bh=XcGdDK+5Al2PljZ8FZVtV7YmxIJ6LBn+ZhoY4QLeFgo=; b=RF0tE5fODf4aOYQKm9T+/dhITlC7N5EjEsryC8pemXoDMkR7NyPxNeuLKJ9KJE9E3RdikF/ao 3uZmrnOvG7/A6JEcYjpf85/CtEIwWCIjW3V7DhqQKCspjnFd7dydoK7 X-Developer-Key: i=alexisczezar.torreno@analog.com; 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It allows monitoring of input/output voltage, output current and temperature through the PMBus serial interface. Signed-off-by: Alexis Czezar Torreno --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/max20830.rst | 49 +++++++++++++++++++++++ MAINTAINERS | 2 + drivers/hwmon/pmbus/Kconfig | 9 +++++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/max20830.c | 86 ++++++++++++++++++++++++++++++++++++++++ 6 files changed, 148 insertions(+) diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 8b655e5d6b68b90c697a52c7bf526e81d370caf7..56f7eb761be76dd627a2f34135abad05203b0582 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers max197 max20730 max20751 + max20830 max31722 max31730 max31760 diff --git a/Documentation/hwmon/max20830.rst b/Documentation/hwmon/max20830.rst new file mode 100644 index 0000000000000000000000000000000000000000..936e409dcc5c0898dde27d782308d4a7e1357e73 --- /dev/null +++ b/Documentation/hwmon/max20830.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver max20830 +====================== + +Supported chips: + + * Analog Devices MAX20830 + + Prefix: 'max20830' + + Addresses scanned: - + + Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max20830.pdf + +Author: + + - Alexis Czezar Torreno + + +Description +----------- + +This driver supports hardware monitoring for Analog Devices MAX20830 +Step-Down Switching Regulator with PMBus Interface. + +The MAX20830 is a 2.7V to 16V, 30A fully integrated step-down DC-DC switching +regulator. Through the PMBus interface, the device can monitor input/output +voltages, output current and temperature. + +The driver is a client driver to the core PMBus driver. Please see +Documentation/hwmon/pmbus.rst for details on PMBus client drivers. + +Sysfs entries +------------- + +================= ======================================== +in1_label "vin" +in1_input Measured input voltage +in1_alarm Input voltage alarm +in2_label "vout1" +in2_input Measured output voltage +in2_alarm Output voltage alarm +curr1_label "iout1" +curr1_input Measured output current +curr1_alarm Output current alarm +temp1_input Measured temperature +temp1_alarm Chip temperature alarm +================= ======================================== diff --git a/MAINTAINERS b/MAINTAINERS index 031c743e979521a92ed9ac67915c178ce31727bd..d6a6745e2dae29c3b8f80bbe61c54a2f5ecd9f47 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15585,6 +15585,8 @@ L: linux-hwmon@vger.kernel.org S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml +F: Documentation/hwmon/max20830.rst +F: drivers/hwmon/pmbus/max20830.c MAX2175 SDR TUNER DRIVER M: Ramesh Shanmugasundaram diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 8f4bff375ecbc355f5ed3400855c2852ec2aa5ef..987705bf45b75b7b91ccc469247909f3c3f53d77 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -365,6 +365,15 @@ config SENSORS_MAX20751 This driver can also be built as a module. If so, the module will be called max20751. +config SENSORS_MAX20830 + tristate "Analog Devices MAX20830" + help + If you say yes here you get hardware monitoring support for Analog + Devices MAX20830. + + This driver can also be built as a module. If so, the module will + be called max20830. + config SENSORS_MAX31785 tristate "Maxim MAX31785 and compatibles" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 7129b62bc00f8a2e98de14004997752a856dfda2..bc52f930e0825a902a0dd1c9e2b44f2e8d577c35 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_SENSORS_MAX16601) += max16601.o obj-$(CONFIG_SENSORS_MAX17616) += max17616.o obj-$(CONFIG_SENSORS_MAX20730) += max20730.o obj-$(CONFIG_SENSORS_MAX20751) += max20751.o +obj-$(CONFIG_SENSORS_MAX20830) += max20830.o obj-$(CONFIG_SENSORS_MAX31785) += max31785.o obj-$(CONFIG_SENSORS_MAX34440) += max34440.o obj-$(CONFIG_SENSORS_MAX8688) += max8688.o diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c new file mode 100644 index 0000000000000000000000000000000000000000..21ea8b59150cb0564f1776ee08131bad7fdef003 --- /dev/null +++ b/drivers/hwmon/pmbus/max20830.c @@ -0,0 +1,86 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hardware monitoring driver for Analog Devices MAX20830 + * + * Copyright (C) 2026 Analog Devices, Inc. + */ + +#include +#include +#include +#include "pmbus.h" + +static struct pmbus_driver_info max20830_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = linear, + .format[PSC_CURRENT_OUT] = linear, + .format[PSC_TEMPERATURE] = linear, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | + PMBUS_HAVE_TEMP | + PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT | + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP, +}; + +static int max20830_probe(struct i2c_client *client) +{ + u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; + u8 len; + int ret; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_I2C_BLOCK)) + return -ENODEV; + + /* + * Use i2c_smbus_read_i2c_block_data() instead of + * i2c_smbus_read_block_data() to support I2C controllers + * which do not support SMBus block reads. + */ + ret = i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID, + I2C_SMBUS_BLOCK_MAX, buf); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "Failed to read IC_DEVICE_ID\n"); + + /* First byte is the block length. */ + len = buf[0]; + if (len != 9) + return dev_err_probe(&client->dev, -ENODEV, + "Unexpected IC_DEVICE_ID response\n"); + + buf[len] = '\0'; + if (strncmp(buf + 1, "MAX20830", 8)) + return dev_err_probe(&client->dev, -ENODEV, + "Unsupported device: '%s'\n", buf + 1); + + return pmbus_do_probe(client, &max20830_info); +} + +static const struct i2c_device_id max20830_id[] = { + {"max20830"}, + { } +}; +MODULE_DEVICE_TABLE(i2c, max20830_id); + +static const struct of_device_id max20830_of_match[] = { + { .compatible = "adi,max20830" }, + { } +}; +MODULE_DEVICE_TABLE(of, max20830_of_match); + +static struct i2c_driver max20830_driver = { + .driver = { + .name = "max20830", + .of_match_table = max20830_of_match, + }, + .probe = max20830_probe, + .id_table = max20830_id, +}; + +module_i2c_driver(max20830_driver); + +MODULE_AUTHOR("Alexis Czezar Torreno "); +MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX20830"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("PMBUS"); -- 2.34.1