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Message-ID: <20251208071659.1157-3-Yuxi.Wang@monolithicpower.com>
Date: Mon, 8 Dec 2025 15:16:59 +0800
From: Yuxi Wang <Yuxi.Wang@...olithicpower.com>
To: <Yuxi.Wang@...olithicpower.com>, <linux@...ck-us.net>, <corbet@....net>,
<robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <wyx137120466@...il.com>, <linux-hwmon@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH 2/2] hwmon: add mp5926 driver
Add support for MPS mp5926.
Signed-off-by: Yuxi Wang <Yuxi.Wang@...olithicpower.com>
---
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/mp5926.rst | 92 ++++++++++++++++
MAINTAINERS | 7 ++
drivers/hwmon/pmbus/Kconfig | 9 ++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/mp5926.c | 192 +++++++++++++++++++++++++++++++++
6 files changed, 302 insertions(+)
create mode 100644 Documentation/hwmon/mp5926.rst
create mode 100644 drivers/hwmon/pmbus/mp5926.c
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 85d7a686883e..6181c3f62177 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -185,6 +185,7 @@ Hardware Monitoring Kernel Drivers
mp2993
mp5023
mp5920
+ mp5926
mp5990
mp9941
mp9945
diff --git a/Documentation/hwmon/mp5926.rst b/Documentation/hwmon/mp5926.rst
new file mode 100644
index 000000000000..4b64a7e24ae6
--- /dev/null
+++ b/Documentation/hwmon/mp5926.rst
@@ -0,0 +1,92 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp5926
+====================
+
+Supported chips:
+
+ * MPS mp5926
+
+ Prefix: 'mp5926'
+
+ * Datasheet
+ https://www.monolithicpower.com/en/
+
+Author:
+
+ Yuxi Wang <Yuxi.Wang@...olithicpower.com>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+MP5926 Hot-Swap Controller.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+The driver exports the following attributes via the 'sysfs' files
+for input voltage:
+
+**in1_input**
+
+**in1_label**
+
+**in1_crit**
+
+**in1_crit_alarm**
+
+The driver provides the following attributes for output voltage:
+
+**in2_input**
+
+**in2_label**
+
+**in2_lcrit**
+
+**in2_lcrit_alarm**
+
+**in2_rated_max**
+
+**in2_rated_min**
+
+The driver provides the following attributes for input current:
+
+**curr1_input**
+
+**curr1_label**
+
+**curr1_max**
+
+**curr1_max_alarm**
+
+The driver provides the following attributes for output current:
+
+**curr2_input**
+
+**curr2_label**
+
+The driver provides the following attributes for input power:
+
+**power1_input**
+
+**power1_label**
+
+The driver provides the following attributes for output power:
+
+**power2_input**
+
+**power2_label**
+
+The driver provides the following attributes for temperature:
+
+**temp1_input**
+
+**temp1_crit**
+
+**temp1_crit_alarm**
+
+**temp1_max**
+
+**temp1_max_alarm**
diff --git a/MAINTAINERS b/MAINTAINERS
index d701a4d5b00e..fea710aab535 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17708,6 +17708,13 @@ S: Maintained
F: Documentation/hwmon/mp2993.rst
F: drivers/hwmon/pmbus/mp2993.c
+MPS MP5926 DRIVER
+M: Yuxi Wang <Yuxi.Wang@...olithicpower.com>
+L: linux-hwmon@...r.kernel.org
+S: Maintained
+F: Documentation/hwmon/mp5926.rst
+F: drivers/hwmon/pmbus/mp5926.c
+
MPS MP9941 DRIVER
M: Noah Wang <noahwang.wang@...look.com>
L: linux-hwmon@...r.kernel.org
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index f3fb94cebf1a..0a6699fa976a 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -472,6 +472,15 @@ config SENSORS_MP5920
This driver can also be built as a module. If so, the module will
be called mp5920.
+config SENSORS_MP5926
+ tristate "MPS MP5926"
+ help
+ If you say yes here you get hardware monitoring support for Monolithic
+ MP5926.
+
+ This driver can also be built as a module. If so, the module will
+ be called MP5926.
+
config SENSORS_MP5990
tristate "MPS MP5990"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 349a89b6d92e..75ec4956ca8d 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_MP2993) += mp2993.o
obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
obj-$(CONFIG_SENSORS_MP5920) += mp5920.o
+obj-$(CONFIG_SENSORS_MP5926) += mp5926.o
obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
obj-$(CONFIG_SENSORS_MP9941) += mp9941.o
obj-$(CONFIG_SENSORS_MP9945) += mp9945.o
diff --git a/drivers/hwmon/pmbus/mp5926.c b/drivers/hwmon/pmbus/mp5926.c
new file mode 100644
index 000000000000..e86ec1ec0584
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp5926.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// mp5926.c - pmbus driver for mps mp5926
+//
+// Copyright 2025 Monolithic Power Systems, Inc
+//
+// Author: Yuxi Wang <Yuxi.Wang@...olithicpower.com>
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+/*Common Register*/
+#define PAGE 0x01
+#define EFUSE_CFG 0xCF
+#define I_SCALE_SEL 0xC6
+#define MP5926_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
+ PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | \
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_INPUT | \
+ PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_VOUT)
+static int mp5926_read_word_data(struct i2c_client *client, int page, int phase,
+ int reg)
+{
+ int ret;
+ s16 exponent;
+ s32 mantissa;
+ s64 val;
+
+ switch (reg) {
+ case PMBUS_READ_VIN...PMBUS_READ_VCAP:
+ case PMBUS_READ_IOUT...PMBUS_READ_TEMPERATURE_1:
+ case PMBUS_READ_PIN:
+ case PMBUS_STATUS_WORD:
+ ret = -ENODATA;
+ break;
+ case PMBUS_READ_VOUT:
+ // The Vout format used by the chip is linear11 and not linear16.
+ // So we transform the value into the direct format defined by PMBus.
+ ret = i2c_smbus_read_word_data(client, EFUSE_CFG);
+ if (ret < 0)
+ return ret;
+ if (ret & BIT(12)) {
+ ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
+ if (ret < 0)
+ return ret;
+ exponent = ((s16)ret) >> 11;
+ mantissa = ((s16)((ret & 0x7ff) << 5)) >> 5;
+ val = mantissa * 1000;
+ if (exponent >= 0)
+ val <<= exponent;
+ else
+ val >>= -exponent;
+ val = div_s64(val * 10 + 313L, 625L);
+ return val;
+ }
+ ret = -ENODATA;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int mp5926_read_byte_data(struct i2c_client *client, int page,
+ int reg)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_STATUS_BYTE:
+ case PMBUS_STATUS_VOUT:
+ case PMBUS_STATUS_INPUT:
+ case PMBUS_STATUS_TEMPERATURE:
+ case PMBUS_STATUS_CML:
+ case PMBUS_STATUS_MFR_SPECIFIC:
+ ret = -ENODATA;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static struct pmbus_driver_info mp5926_info_linear = {
+ .pages = PAGE,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_POWER] = linear,
+
+ .m[PSC_VOLTAGE_OUT] = 16,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 0,
+
+ .read_word_data = mp5926_read_word_data,
+ .read_byte_data = mp5926_read_byte_data,
+ .func[0] = MP5926_FUNC,
+};
+
+static struct pmbus_driver_info mp5926_info_direct = {
+ .pages = PAGE,
+ .format[PSC_VOLTAGE_IN] = direct,
+ .format[PSC_CURRENT_IN] = direct,
+ .format[PSC_VOLTAGE_OUT] = direct,
+ .format[PSC_TEMPERATURE] = direct,
+ .format[PSC_POWER] = direct,
+
+ .m[PSC_VOLTAGE_IN] = 16,
+ .b[PSC_VOLTAGE_IN] = 0,
+ .R[PSC_VOLTAGE_IN] = 0,
+
+ .m[PSC_CURRENT_IN] = 16,
+ .b[PSC_CURRENT_IN] = 0,
+ .R[PSC_CURRENT_IN] = 0,
+
+ .m[PSC_VOLTAGE_OUT] = 16,
+ .b[PSC_VOLTAGE_OUT] = 0,
+ .R[PSC_VOLTAGE_OUT] = 0,
+
+ .m[PSC_TEMPERATURE] = 4,
+ .b[PSC_TEMPERATURE] = 0,
+ .R[PSC_TEMPERATURE] = 3,
+
+ .m[PSC_POWER] = 25,
+ .b[PSC_POWER] = 0,
+ .R[PSC_POWER] = -2,
+
+ .read_word_data = mp5926_read_word_data,
+ .read_byte_data = mp5926_read_byte_data,
+ .func[0] = MP5926_FUNC,
+};
+
+static int mp5926_probe(struct i2c_client *client)
+{
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+ ret = i2c_smbus_read_word_data(client, EFUSE_CFG);
+ if (ret < 0)
+ return ret;
+ if (ret & BIT(12)) {
+ ret = pmbus_do_probe(client, &mp5926_info_linear);
+ } else {
+ ret = i2c_smbus_read_word_data(client, I_SCALE_SEL);
+ if (ret < 0)
+ return ret;
+ if (ret & BIT(6))
+ mp5926_info_direct.m[PSC_CURRENT_IN] = 4;
+ ret = pmbus_do_probe(client, &mp5926_info_direct);
+ }
+ if (!ret)
+ dev_info(&client->dev, "%s chip found\n", client->name);
+ return ret;
+}
+
+static const struct i2c_device_id mp5926_id[] = {
+ { "mp5926", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mp5926_id);
+
+static const struct of_device_id mp5926_of_match[] = {
+ { .compatible = "mps,mp5926" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mp5926_of_match);
+
+static struct i2c_driver mp5926_driver = {
+ .probe = mp5926_probe,
+ .driver = {
+ .name = "mp5926",
+ .of_match_table = mp5926_of_match,
+ },
+ .id_table = mp5926_id,
+};
+
+module_i2c_driver(mp5926_driver);
+MODULE_AUTHOR("Yuxi Wang <Yuxi.Wang@...olithicpower.com>");
+MODULE_DESCRIPTION("MPS MP5926 HWMON driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.39.2
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