[PATCH 2/2] hwmon: (pmbus) Add driver for Analog Devices MAX20912 and MAX20916

[Fred Chen <fredchen.openbmc@gmail.com>]

Add support for the Analog Devices MAX20912 and MAX20916 dual-output
multiphase voltage regulators with PMBus interfaces.

Signed-off-by: Fred Chen <fredchen.openbmc@gmail.com>
---
 Documentation/hwmon/index.rst    |   1 +
 Documentation/hwmon/max20912.rst | 156 +++++++++++++++++++++++++++++++
 MAINTAINERS                      |   7 ++
 drivers/hwmon/pmbus/Kconfig      |   9 ++
 drivers/hwmon/pmbus/Makefile     |   1 +
 drivers/hwmon/pmbus/max20912.c   |  70 ++++++++++++++
 6 files changed, 244 insertions(+)
 create mode 100644 Documentation/hwmon/max20912.rst
 create mode 100644 drivers/hwmon/pmbus/max20912.c

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 29130df44d12..4fadb7e961b2 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -166,6 +166,7 @@ Hardware Monitoring Kernel Drivers
    max20751
    max20830
    max20860a
+   max20912
    max31722
    max31730
    max31760
diff --git a/Documentation/hwmon/max20912.rst b/Documentation/hwmon/max20912.rst
new file mode 100644
index 000000000000..da1430751e93
--- /dev/null
+++ b/Documentation/hwmon/max20912.rst
@@ -0,0 +1,156 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver max20912
+======================
+
+Supported chips:
+
+  * Analog Devices MAX20912
+
+    Prefix: 'max20912'
+
+    Datasheet: Not publicly available
+
+  * Analog Devices MAX20916
+
+    Prefix: 'max20916'
+
+    Datasheet: Not publicly available
+
+Author:
+
+	Fred Chen <fredchen.openbmc@gmail.com>
+
+Description
+-----------
+
+This driver implements support for the Analog Devices MAX20912 and MAX20916
+high-density, flexible, and scalable dual-output multiphase voltage regulators.
+
+The MAX20912 supports up to 12 phases in total, configurable from 12+0 to
+6+6 phases between Rail A and Rail B.
+
+The MAX20916 supports up to 16 phases in total, configurable from 16+0 to
+8+8 phases between Rail A and Rail B.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+Both devices expose two independently regulated output voltage rails,
+Rail A and Rail B, using the VR12 VID interface. Each rail reports input
+current, output current, temperature, input power, and output power.
+Input voltage is reported on Rail A only.
+
+The driver exports the following attributes via the 'sysfs' files
+for input voltage:
+
+**in1_input**
+
+**in1_label**
+
+**in1_alarm**
+
+The driver provides the following attributes for output voltage:
+
+**in2_input**
+
+**in2_label**
+
+**in2_alarm**
+
+**in3_input**
+
+**in3_label**
+
+**in3_alarm**
+
+The driver provides the following attributes for input current:
+
+**curr1_input**
+
+**curr1_label**
+
+**curr1_max**
+
+**curr1_max_alarm**
+
+**curr2_input**
+
+**curr2_label**
+
+**curr2_max**
+
+**curr2_max_alarm**
+
+The driver provides the following attributes for output current:
+
+**curr3_input**
+
+**curr3_label**
+
+**curr3_max**
+
+**curr3_max_alarm**
+
+**curr3_crit**
+
+**curr3_crit_alarm**
+
+**curr4_input**
+
+**curr4_label**
+
+**curr4_max**
+
+**curr4_max_alarm**
+
+**curr4_crit**
+
+**curr4_crit_alarm**
+
+The driver provides the following attributes for temperature:
+
+**temp1_input**
+
+**temp1_max**
+
+**temp1_max_alarm**
+
+**temp1_crit**
+
+**temp1_crit_alarm**
+
+**temp2_input**
+
+**temp2_max**
+
+**temp2_max_alarm**
+
+**temp2_crit**
+
+**temp2_crit_alarm**
+
+The driver provides the following attributes for input power:
+
+**power1_input**
+
+**power1_label**
+
+**power1_alarm**
+
+**power2_input**
+
+**power2_label**
+
+**power2_alarm**
+
+The driver provides the following attributes for output power:
+
+**power3_input**
+
+**power3_label**
+
+**power4_input**
+
+**power4_label**
diff --git a/MAINTAINERS b/MAINTAINERS
index 4a8b0fd665ce..a301af7ff6fd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15851,6 +15851,13 @@ F:	Documentation/devicetree/bindings/hwmon/pmbus/adi,max20860a.yaml
 F:	Documentation/hwmon/max20860a.rst
 F:	drivers/hwmon/pmbus/max20860a.c
 
+MAX20912 HARDWARE MONITOR DRIVER
+M:	Fred Chen <fredchen.openbmc@gmail.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Maintained
+F:	Documentation/hwmon/max20912.rst
+F:	drivers/hwmon/pmbus/max20912.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 c8cda160b5f8..442c3538bf7c 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -421,6 +421,15 @@ config SENSORS_MAX20860A_REGULATOR
 	  This enables the MAX20860A to be used as a regulator device,
 	  providing voltage control through the regulator framework.
 
+config SENSORS_MAX20912
+	tristate "Analog Devices MAX20912 and MAX20916"
+	help
+	  If you say yes here you get hardware monitoring support for Analog
+	  Devices MAX20912 and MAX20916 dual-output voltage regulators.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called max20912.
+
 config SENSORS_MAX31785
 	tristate "Maxim MAX31785 and compatibles"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index ffc05f493213..2fa74f0caf18 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -40,6 +40,7 @@ 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-$(CONFIG_SENSORS_MAX20912)	+= max20912.o
 obj-$(CONFIG_SENSORS_MAX31785)	+= max31785.o
 obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
diff --git a/drivers/hwmon/pmbus/max20912.c b/drivers/hwmon/pmbus/max20912.c
new file mode 100644
index 000000000000..3d028a619678
--- /dev/null
+++ b/drivers/hwmon/pmbus/max20912.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for Analog Devices MAX20912 and MAX20916
+ * Dual-Output Voltage Regulator
+ *
+ * Copyright (c) 2026 Quanta Computer Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info max20912_info = {
+	.pages = 2,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = vid,
+	.vrm_version[0] = vr12,
+	.vrm_version[1] = vr12,
+	.format[PSC_TEMPERATURE] = linear,
+	.format[PSC_CURRENT_IN] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.format[PSC_POWER] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
+		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+		PMBUS_HAVE_PIN | PMBUS_HAVE_POUT,
+	.func[1] = PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT |
+		PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+		PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
+		PMBUS_HAVE_PIN | PMBUS_HAVE_POUT,
+};
+
+static int max20912_probe(struct i2c_client *client)
+{
+	return pmbus_do_probe(client, &max20912_info);
+}
+
+static const struct of_device_id max20912_of_match[] = {
+	{ .compatible = "adi,max20912" },
+	{ .compatible = "adi,max20916" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, max20912_of_match);
+
+static const struct i2c_device_id max20912_id[] = {
+	{"max20912"},
+	{"max20916"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, max20912_id);
+
+static struct i2c_driver max20912_driver = {
+	.driver = {
+		.name = "max20912",
+		.of_match_table = max20912_of_match,
+	},
+	.probe = max20912_probe,
+	.id_table = max20912_id,
+};
+
+module_i2c_driver(max20912_driver);
+
+MODULE_AUTHOR("Fred Chen <fredchen.openbmc@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices MAX20912 and MAX20916");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
-- 
2.52.0