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Acked-by: Conor Dooley Signed-off-by: Alexis Czezar Torreno --- .../bindings/hwmon/pmbus/adi,max20830.yaml | 66 ++++++++++++++++++= ++++ MAINTAINERS | 7 +++ 2 files changed, 73 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yam= l b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml new file mode 100644 index 0000000000000000000000000000000000000000..1625dd59417f1b3ca689a9c86ca= 266da913d1217 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml @@ -0,0 +1,66 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20830.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices MAX20830 Step-Down Switching Regulator with PMBus + +maintainers: + - Alexis Czezar Torreno + +description: | + The MAX20830 is a fully integrated step-down DC-DC switching regulator w= ith + PMBus interface. It provides 2.7V to 16V input, 0.4V to 5.8V adjustable + output, and up to 30A output current. It allows monitoring of input/outp= ut + voltage, output current and temperature through the PMBus serial interfa= ce. + Datasheet: + https://www.analog.com/en/products/max20830.html + +allOf: + - $ref: /schemas/regulator/regulator.yaml# + +properties: + compatible: + const: adi,max20830 + + reg: + maxItems: 1 + + vddh-supply: + description: + Phandle to the regulator that provides the VDDH power supply. + + avdd-supply: + description: + Phandle to the regulator that provides the AVDD power supply. + + ldoin-supply: + description: + Optional 2.5V to 5.5V LDO input supply. + + pwr-good-gpios: + description: + GPIO connected to the power-good status output pin. + maxItems: 1 + +required: + - compatible + - reg + - vddh-supply + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells =3D <1>; + #size-cells =3D <0>; + + regulator@30 { + compatible =3D "adi,max20830"; + reg =3D <0x30>; + vddh-supply =3D <&vddh>; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 0a3991c10ade20dd79cc7d1bf2a1d307ba6bd19d..031c743e979521a92ed9ac67915= c178ce31727bd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15579,6 +15579,13 @@ F: Documentation/devicetree/bindings/hwmon/pmbus/a= di,max17616.yaml F: Documentation/hwmon/max17616.rst F: drivers/hwmon/pmbus/max17616.c =20 +MAX20830 HARDWARE MONITOR DRIVER +M: Alexis Czezar Torreno +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 + MAX2175 SDR TUNER DRIVER M: Ramesh Shanmugasundaram L: linux-media@vger.kernel.org --=20 2.34.1 From nobody Sat Jun 13 23:09:53 2026 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49EA232938D; 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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 | 110 +++++++++++++++++++++++++++++++++++= ++++ 6 files changed, 172 insertions(+) diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 8b655e5d6b68b90c697a52c7bf526e81d370caf7..56f7eb761be76dd627a2f34135a= bad05203b0582 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/max2083= 0.rst new file mode 100644 index 0000000000000000000000000000000000000000..936e409dcc5c0898dde27d78230= 8d4a7e1357e73 --- /dev/null +++ b/Documentation/hwmon/max20830.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver max20830 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Supported chips: + + * Analog Devices MAX20830 + + Prefix: 'max20830' + + Addresses scanned: - + + Datasheet: https://www.analog.com/media/en/technical-documentation/dat= a-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 switch= ing +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 +------------- + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D +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 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D diff --git a/MAINTAINERS b/MAINTAINERS index 031c743e979521a92ed9ac67915c178ce31727bd..d6a6745e2dae29c3b8f80bbe61c= 54a2f5ecd9f47 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 =20 MAX2175 SDR TUNER DRIVER M: Ramesh Shanmugasundaram diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 8f4bff375ecbc355f5ed3400855c2852ec2aa5ef..987705bf45b75b7b91ccc469247= 909f3c3f53d77 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. =20 +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..bc52f930e0825a902a0dd1c9e2b= 44f2e8d577c35 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_SENSORS_MAX16601) +=3D max16601.o obj-$(CONFIG_SENSORS_MAX17616) +=3D max17616.o obj-$(CONFIG_SENSORS_MAX20730) +=3D max20730.o obj-$(CONFIG_SENSORS_MAX20751) +=3D max20751.o +obj-$(CONFIG_SENSORS_MAX20830) +=3D max20830.o obj-$(CONFIG_SENSORS_MAX31785) +=3D max31785.o obj-$(CONFIG_SENSORS_MAX34440) +=3D max34440.o obj-$(CONFIG_SENSORS_MAX8688) +=3D max8688.o diff --git a/drivers/hwmon/pmbus/max20830.c b/drivers/hwmon/pmbus/max20830.c new file mode 100644 index 0000000000000000000000000000000000000000..0f958e5eae1fa97e12ec73de110= 3cfed3d9228cb --- /dev/null +++ b/drivers/hwmon/pmbus/max20830.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hardware monitoring driver for Analog Devices MAX20830 + * + * Copyright (C) 2026 Analog Devices, Inc. + */ + +#include +#include +#include +#include +#include +#include "pmbus.h" + +#define MAX20830_IC_DEVICE_ID_LENGTH 9 + +static struct pmbus_driver_info max20830_info =3D { + .pages =3D 1, + .format[PSC_VOLTAGE_IN] =3D linear, + .format[PSC_VOLTAGE_OUT] =3D linear, + .format[PSC_CURRENT_OUT] =3D linear, + .format[PSC_TEMPERATURE] =3D linear, + .func[0] =3D 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] =3D {}; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_D= ATA) && + !i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLO= CK)) + return -ENODEV; + + /* + * Use i2c_smbus_read_block_data() if supported, otherwise fall back + * to i2c_smbus_read_i2c_block_data() to support I2C controllers + * which do not support SMBus block reads. + */ + if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_BLOCK_DA= TA)) { + /* Reads 9 Data bytes from MAX20830 */ + ret =3D i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "Failed to read IC_DEVICE_ID\n"); + } else { + /* Reads 1 length byte + 9 Data bytes from MAX20830 */ + ret =3D i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID, + MAX20830_IC_DEVICE_ID_LENGTH + 1, + buf); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "Failed to read IC_DEVICE_ID\n"); + /* + * Moves data forward, removing the length byte, this is to + * match the format of i2c_smbus_read_block_data(). + * Also adjust return value to reflect length byte removal. + */ + memmove(buf, buf + 1, MAX20830_IC_DEVICE_ID_LENGTH); + ret =3D ret - 1; + } + + /* + * MAX20830 IC_DEVICE_ID sends string data "MAX20830\0". + * Return value should at least be 9 bytes of data. + */ + if (ret < MAX20830_IC_DEVICE_ID_LENGTH) + return dev_err_probe(&client->dev, -ENODEV, + "IC_DEVICE_ID too short: expected at least 9 bytes, got %d\n", + ret); + + /* 9 bytes of data, buf[0]-buf[7] =3D "MAX20830", buf[8] =3D '\0' */ + buf[MAX20830_IC_DEVICE_ID_LENGTH-1] =3D '\0'; + if (strncmp(buf, "MAX20830", MAX20830_IC_DEVICE_ID_LENGTH-1)) + return dev_err_probe(&client->dev, -ENODEV, + "Unsupported device: '%s'\n", buf); + + return pmbus_do_probe(client, &max20830_info); +} + +static const struct i2c_device_id max20830_id[] =3D { + {"max20830"}, + { } +}; +MODULE_DEVICE_TABLE(i2c, max20830_id); + +static const struct of_device_id max20830_of_match[] =3D { + { .compatible =3D "adi,max20830" }, + { } +}; +MODULE_DEVICE_TABLE(of, max20830_of_match); + +static struct i2c_driver max20830_driver =3D { + .driver =3D { + .name =3D "max20830", + .of_match_table =3D max20830_of_match, + }, + .probe =3D max20830_probe, + .id_table =3D 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"); --=20 2.34.1