* [PATCH 1/2] dt-bindings: hwmon: pmbus: Add Murata D1U74T PSU
2026-05-12 1:44 [PATCH 0/2] hwmon: Add Murata D1U74T-W PSU driver Abdurrahman Hussain
@ 2026-05-12 1:44 ` Abdurrahman Hussain
2026-05-12 16:41 ` Conor Dooley
2026-05-12 1:44 ` [PATCH 2/2] hwmon: (pmbus/d1u74t) Add Murata D1U74T PSU driver Abdurrahman Hussain
1 sibling, 1 reply; 4+ messages in thread
From: Abdurrahman Hussain @ 2026-05-12 1:44 UTC (permalink / raw)
To: Guenter Roeck, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Jonathan Corbet, Shuah Khan
Cc: linux-hwmon, devicetree, linux-kernel, linux-doc,
Abdurrahman Hussain
Add devicetree binding for the Murata D1U74T-W PMBus power supply
unit.
Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
---
.../bindings/hwmon/pmbus/murata,d1u74t.yaml | 41 ++++++++++++++++++++++
MAINTAINERS | 6 ++++
2 files changed, 47 insertions(+)
diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/murata,d1u74t.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/murata,d1u74t.yaml
new file mode 100644
index 000000000000..ef080283bf79
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/murata,d1u74t.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/pmbus/murata,d1u74t.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Murata D1U74T-W power supply unit
+
+maintainers:
+ - Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+description:
+ The Murata D1U74T-W is a PMBus-compliant AC/DC power supply unit that
+ exposes input/output voltage, current and power telemetry, three
+ temperature sensors and dual fan monitoring over an I2C interface.
+
+properties:
+ compatible:
+ enum:
+ - murata,d1u74t
+
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ psu@58 {
+ compatible = "murata,d1u74t";
+ reg = <0x58>;
+ };
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index b2040011a386..b6a055fbb870 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6803,6 +6803,12 @@ S: Maintained
F: Documentation/hwmon/crps.rst
F: drivers/hwmon/pmbus/crps.c
+MURATA D1U74T PSU DRIVER
+M: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/hwmon/pmbus/murata,d1u74t.yaml
+
CRYPTO API
M: Herbert Xu <herbert@gondor.apana.org.au>
M: "David S. Miller" <davem@davemloft.net>
--
2.53.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/2] hwmon: (pmbus/d1u74t) Add Murata D1U74T PSU driver
2026-05-12 1:44 [PATCH 0/2] hwmon: Add Murata D1U74T-W PSU driver Abdurrahman Hussain
2026-05-12 1:44 ` [PATCH 1/2] dt-bindings: hwmon: pmbus: Add Murata D1U74T PSU Abdurrahman Hussain
@ 2026-05-12 1:44 ` Abdurrahman Hussain
1 sibling, 0 replies; 4+ messages in thread
From: Abdurrahman Hussain @ 2026-05-12 1:44 UTC (permalink / raw)
To: Guenter Roeck, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Jonathan Corbet, Shuah Khan
Cc: linux-hwmon, devicetree, linux-kernel, linux-doc,
Abdurrahman Hussain
Add PMBUS driver for Murata D1U74T power supplies.
Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
---
Documentation/hwmon/d1u74t.rst | 97 ++++++++++++++++++++++++++++++++++++++++++
Documentation/hwmon/index.rst | 1 +
MAINTAINERS | 2 +
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/d1u74t.c | 85 ++++++++++++++++++++++++++++++++++++
6 files changed, 195 insertions(+)
diff --git a/Documentation/hwmon/d1u74t.rst b/Documentation/hwmon/d1u74t.rst
new file mode 100644
index 000000000000..f7786ebba0b4
--- /dev/null
+++ b/Documentation/hwmon/d1u74t.rst
@@ -0,0 +1,97 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver d1u74t
+==================
+
+Supported chips:
+
+ * Murata D1U74T
+
+ Prefix: 'd1u74t'
+
+ Addresses scanned: -
+
+ Datasheet: Only available under NDA.
+
+Authors:
+ Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+
+Description
+-----------
+
+This driver implements support for Murata D1U74T Power Supply with
+PMBus support.
+
+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. Please see Documentation/i2c/instantiating-devices.rst for
+details.
+
+
+Sysfs entries
+-------------
+
+======================= ======================================================
+curr1_label "iin"
+curr1_input Measured input current
+curr1_max Maximum input current
+curr1_max_alarm Input maximum current high alarm
+curr1_crit Critical high input current
+curr1_crit_alarm Input critical current high alarm
+curr1_rated_max Maximum rated input current
+
+curr2_label "iout1"
+curr2_input Measured output current
+curr2_max Maximum output current
+curr2_max_alarm Output maximum current high alarm
+curr2_crit Critical high output current
+curr2_crit_alarm Output critical current high alarm
+curr2_rated_max Maximum rated output current
+
+in1_label "vin"
+in1_input Measured input voltage
+in1_crit Critical input over voltage
+in1_crit_alarm Critical input over voltage alarm
+in1_max Maximum input over voltage
+in1_max_alarm Maximum input over voltage alarm
+in1_rated_min Minimum rated input voltage
+in1_rated_max Maximum rated input voltage
+
+in2_label "vout1"
+in2_input Measured input voltage
+in2_crit Critical input over voltage
+in2_crit_alarm Critical input over voltage alarm
+in2_lcrit Critical input under voltage fault
+in2_lcrit_alarm Critical input under voltage fault alarm
+in2_max Maximum input over voltage
+in2_max_alarm Maximum input over voltage alarm
+in2_min Minimum input under voltage warning
+in2_min_alarm Minimum input under voltage warning alarm
+in2_rated_min Minimum rated input voltage
+in2_rated_max Maximum rated input voltage
+
+power1_label "pin"
+power1_input Measured input power
+power1_alarm Input power high alarm
+power1_max Maximum input power
+power1_rated_max Maximum rated input power
+
+temp[1-3]_input Measured temperature
+temp[1-3]_crit Critical temperature
+temp[1-3]_crit_alarm Critical temperature alarm
+temp[1-3]_max Maximum temperature
+temp[1-3]_max_alarm Maximum temperature alarm
+temp[1-3]_rated_max Maximum rated temperature
+
+fan1_alarm Fan 1 warning.
+fan1_fault Fan 1 fault.
+fan1_input Fan 1 speed in RPM.
+fan1_target Fan 1 target.
+======================= ======================================================
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 8b655e5d6b68..97b1ef65b1c1 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -60,6 +60,7 @@ Hardware Monitoring Kernel Drivers
corsair-psu
cros_ec_hwmon
crps
+ d1u74t
da9052
da9055
dell-smm-hwmon
diff --git a/MAINTAINERS b/MAINTAINERS
index b6a055fbb870..8f443a2f0e45 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6808,6 +6808,8 @@ M: Abdurrahman Hussain <abdurrahman@nexthop.ai>
L: linux-hwmon@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/hwmon/pmbus/murata,d1u74t.yaml
+F: Documentation/hwmon/d1u74t.rst
+F: drivers/hwmon/pmbus/d1u74t.c
CRYPTO API
M: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 8f4bff375ecb..ee93b22d2887 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -113,6 +113,15 @@ config SENSORS_CRPS
This driver can also be built as a module. If so, the module will
be called crps.
+config SENSORS_D1U74T
+ tristate "Murata D1U74T Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for the Murata
+ D1U74T Power Supply.
+
+ This driver can also be built as a module. If so, the module will
+ be called d1u74t.
+
config SENSORS_DELTA_AHE50DC_FAN
tristate "Delta AHE-50DC fan control module"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 7129b62bc00f..8cf7d3075371 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -76,3 +76,4 @@ obj-$(CONFIG_SENSORS_XDPE1A2G7B) += xdpe1a2g7b.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o
obj-$(CONFIG_SENSORS_CRPS) += crps.o
+obj-$(CONFIG_SENSORS_D1U74T) += d1u74t.o
diff --git a/drivers/hwmon/pmbus/d1u74t.c b/drivers/hwmon/pmbus/d1u74t.c
new file mode 100644
index 000000000000..3127e0e5a23d
--- /dev/null
+++ b/drivers/hwmon/pmbus/d1u74t.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2026 Nexthop Systems.
+ */
+
+#include <linux/i2c.h>
+#include <linux/of.h>
+#include <linux/pmbus.h>
+
+#include "pmbus.h"
+
+static const struct i2c_device_id d1u74t_id[] = {
+ { "d1u74t" },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, d1u74t_id);
+
+static struct pmbus_driver_info d1u74t_info = {
+ .pages = 1,
+ /* PSU uses default linear data format. */
+ .func[0] = PMBUS_HAVE_PIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_IIN | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_TEMP |
+ PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
+ PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_FAN12 |
+ PMBUS_HAVE_STATUS_FAN12,
+};
+
+static int d1u74t_probe(struct i2c_client *client)
+{
+ char buf[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+ struct device *dev = &client->dev;
+ int rc;
+
+ rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
+ if (rc < 0)
+ return dev_err_probe(dev, rc, "Failed to read PMBUS_MFR_ID\n");
+
+ if (rc != 9 || strncmp(buf, "Murata-PS", 9)) {
+ buf[rc] = '\0';
+ dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf);
+ return -ENODEV;
+ }
+
+ rc = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
+ if (rc < 0)
+ return dev_err_probe(dev, rc,
+ "Failed to read PMBUS_MFR_MODEL\n");
+
+ if (strncmp(buf, "D1U74T-W", 8)) {
+ buf[rc] = '\0';
+ return dev_err_probe(dev, -ENODEV, "Model '%s' not supported\n",
+ buf);
+ }
+
+ rc = pmbus_do_probe(client, &d1u74t_info);
+ if (rc)
+ return dev_err_probe(dev, rc, "Failed to probe\n");
+
+ return 0;
+}
+
+static const struct of_device_id d1u74t_of_match[] = {
+ {
+ .compatible = "murata,d1u74t",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, d1u74t_of_match);
+
+static struct i2c_driver d1u74t_driver = {
+ .driver = {
+ .name = "d1u74t",
+ .of_match_table = d1u74t_of_match,
+ },
+ .probe = d1u74t_probe,
+ .id_table = d1u74t_id,
+};
+
+module_i2c_driver(d1u74t_driver);
+
+MODULE_AUTHOR("Abdurrahman Hussain");
+MODULE_DESCRIPTION("PMBus driver for Murata D1U74T-W power supplies");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.53.0
^ permalink raw reply related [flat|nested] 4+ messages in thread