* [PATCH v2 1/2] dt-bindings: hwmon: pmbus: Add Analog Devices MAX20860A
2026-05-28 17:34 [PATCH v2 0/2] hwmon: (pmbus/max20860a) Add driver for Analog Devices MAX20860A Pradhan, Sanman
@ 2026-05-28 17:34 ` Pradhan, Sanman
2026-05-28 17:41 ` Conor Dooley
2026-05-28 17:34 ` [PATCH v2 2/2] hwmon: (pmbus/max20860a) Add driver for " Pradhan, Sanman
1 sibling, 1 reply; 5+ messages in thread
From: Pradhan, Sanman @ 2026-05-28 17:34 UTC (permalink / raw)
To: linux-hwmon@vger.kernel.org
Cc: linux@roeck-us.net, robh@kernel.org, krzk+dt@kernel.org,
conor+dt@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org,
devicetree@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Syed, Arif, Sanman Pradhan
From: Sanman Pradhan <psanman@juniper.net>
Add devicetree binding documentation for the Analog Devices MAX20860A
step-down DC-DC switching regulator with PMBus interface.
Both "adi,max20860a" and "maxim,max20860a" compatible strings are
supported. The MAX20860A was originally manufactured by Maxim Integrated,
now part of Analog Devices.
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
---
v2:
- Added allOf regulator.yaml reference and unevaluatedProperties
- Added "maxim,max20860a" as alternative compatible
.../bindings/hwmon/pmbus/adi,max20860a.yaml | 47 ++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml
diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml
new file mode 100644
index 000000000000..f7eeb30f11b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/pmbus/adi,max20860a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX20860A Step-Down Converter
+
+maintainers:
+ - Sanman Pradhan <psanman@juniper.net>
+
+description: |
+ The MAX20860A is a fully integrated step-down DC-DC switching regulator
+ with PMBus interface for monitoring input/output voltage, output current
+ and temperature.
+
+ Datasheet: https://www.analog.com/en/products/max20860a.html
+
+allOf:
+ - $ref: /schemas/regulator/regulator.yaml#
+
+properties:
+ compatible:
+ enum:
+ - adi,max20860a
+ - maxim,max20860a
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ regulator@40 {
+ compatible = "adi,max20860a";
+ reg = <0x40>;
+ };
+ };
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 2/2] hwmon: (pmbus/max20860a) Add driver for Analog Devices MAX20860A
2026-05-28 17:34 [PATCH v2 0/2] hwmon: (pmbus/max20860a) Add driver for Analog Devices MAX20860A Pradhan, Sanman
2026-05-28 17:34 ` [PATCH v2 1/2] dt-bindings: hwmon: pmbus: Add " Pradhan, Sanman
@ 2026-05-28 17:34 ` Pradhan, Sanman
1 sibling, 0 replies; 5+ messages in thread
From: Pradhan, Sanman @ 2026-05-28 17:34 UTC (permalink / raw)
To: linux-hwmon@vger.kernel.org
Cc: linux@roeck-us.net, robh@kernel.org, krzk+dt@kernel.org,
conor+dt@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org,
devicetree@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Syed, Arif, Sanman Pradhan
From: Syed Arif <arif.syed@hpe.com>
Add a PMBus driver for the Analog Devices MAX20860A step-down DC-DC
switching regulator. The MAX20860A provides monitoring of input/output
voltage, output current, and temperature via the PMBus interface using
linear data format.
Both "adi,max20860a" and "maxim,max20860a" compatible strings are
supported for devicetree matching.
Signed-off-by: Syed Arif <arif.syed@hpe.com>
Signed-off-by: Sanman Pradhan <psanman@juniper.net>
---
v2:
- Added "maxim,max20860a" to of_device_id table
- Removed WRITE_PROTECT write from probe
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/max20860a.rst | 57 ++++++++++++++++++++++++++++++
MAINTAINERS | 8 +++++
drivers/hwmon/pmbus/Kconfig | 9 +++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/max20860a.c | 58 +++++++++++++++++++++++++++++++
6 files changed, 134 insertions(+)
create mode 100644 Documentation/hwmon/max20860a.rst
create mode 100644 drivers/hwmon/pmbus/max20860a.c
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index e880c6ca84f0..ffaacda416e7 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -163,6 +163,7 @@ Hardware Monitoring Kernel Drivers
max20730
max20751
max20830
+ max20860a
max31722
max31730
max31760
diff --git a/Documentation/hwmon/max20860a.rst b/Documentation/hwmon/max20860a.rst
new file mode 100644
index 000000000000..ea6d2228fafc
--- /dev/null
+++ b/Documentation/hwmon/max20860a.rst
@@ -0,0 +1,57 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver max20860a
+=======================
+
+Supported chips:
+
+ * Analog Devices MAX20860A
+
+ Prefix: 'max20860a'
+
+ Addresses scanned: -
+
+ Datasheet: https://www.analog.com/en/products/max20860a.html
+
+Author:
+
+ - Syed Arif <arif.syed@hpe.com>
+ - Sanman Pradhan <psanman@juniper.net>
+
+
+Description
+-----------
+
+This driver supports hardware monitoring for Analog Devices MAX20860A
+Step-Down Switching Regulator with PMBus Interface.
+
+The MAX20860A is a 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.
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate
+the devices explicitly.
+
+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
+temp2_input Measured temperature (secondary)
+================= ========================================
diff --git a/MAINTAINERS b/MAINTAINERS
index b71acb130395..1d9651947ee3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15688,6 +15688,14 @@ F: Documentation/devicetree/bindings/hwmon/pmbus/adi,max20830.yaml
F: Documentation/hwmon/max20830.rst
F: drivers/hwmon/pmbus/max20830.c
+MAX20860A HARDWARE MONITOR DRIVER
+M: Sanman Pradhan <psanman@juniper.net>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml
+F: Documentation/hwmon/max20860a.rst
+F: drivers/hwmon/pmbus/max20860a.c
+
MAX2175 SDR TUNER DRIVER
M: Ramesh Shanmugasundaram <rashanmu@gmail.com>
L: linux-media@vger.kernel.org
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 64f38654f4e7..5825dda75f2c 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -402,6 +402,15 @@ config SENSORS_MAX20830
This driver can also be built as a module. If so, the module will
be called max20830.
+config SENSORS_MAX20860A
+ tristate "Analog Devices MAX20860A"
+ help
+ If you say yes here you get hardware monitoring support for Analog
+ Devices MAX20860A step-down converter.
+
+ This driver can also be built as a module. If so, the module will
+ be called max20860a.
+
config SENSORS_MAX31785
tristate "Maxim MAX31785 and compatibles"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 1f2c73b71953..ffc05f493213 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -39,6 +39,7 @@ 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_MAX20860A) += max20860a.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/max20860a.c b/drivers/hwmon/pmbus/max20860a.c
new file mode 100644
index 000000000000..5274147ad3d0
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20860a.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for Analog Devices MAX20860A
+ *
+ * SPDX-FileCopyrightText: Copyright Hewlett Packard Enterprise Development LP
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info max20860a_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_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+ PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_INPUT,
+};
+
+static int max20860a_probe(struct i2c_client *client)
+{
+ return pmbus_do_probe(client, &max20860a_info);
+}
+
+static const struct i2c_device_id max20860a_id[] = {
+ {"max20860a"},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, max20860a_id);
+
+static const struct of_device_id max20860a_of_match[] = {
+ { .compatible = "adi,max20860a" },
+ { .compatible = "maxim,max20860a" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, max20860a_of_match);
+
+static struct i2c_driver max20860a_driver = {
+ .driver = {
+ .name = "max20860a",
+ .of_match_table = max20860a_of_match,
+ },
+ .probe = max20860a_probe,
+ .id_table = max20860a_id,
+};
+
+module_i2c_driver(max20860a_driver);
+
+MODULE_AUTHOR("Syed Arif <arif.syed@hpe.com>");
+MODULE_AUTHOR("Sanman Pradhan <psanman@juniper.net>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX20860A");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread