* [PATCH 1/2] dt-bindings: hwmon: pmbus: Add Infineon tda38740 and tda38725
2026-09-07 3:28 [PATCH 0/2] Add driver for Infineon TDA38740/TDA38725 Colin Huang
@ 2026-09-07 3:28 ` Colin Huang
2026-09-07 3:33 ` sashiko-bot
2026-09-07 3:28 ` [PATCH 2/2] hwmon: (pmbus/tda38740) Add driver for Infineon TDA38740/TDA38725 Colin Huang
1 sibling, 1 reply; 5+ messages in thread
From: Colin Huang @ 2026-09-07 3:28 UTC (permalink / raw)
To: Guenter Roeck, Rob Herring, Krzysztof Kozlowski, Conor Dooley
Cc: linux-hwmon, devicetree, linux-kernel, colin.huang2, Colin Huang
From: Colin Huang <u8813345@gmail.com>
Add devicetree bindings for the Infineon TDA38740 and TDA38725
single-voltage synchronous buck regulators with PMBus interface.
Signed-off-by: Colin Huang <u8813345@gmail.com>
---
.../bindings/hwmon/pmbus/infineon,tda38740.yaml | 79 ++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38740.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38740.yaml
new file mode 100644
index 000000000000..02380c09c5f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38740.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: https://devicetree.org/schemas/hwmon/pmbus/infineon,tda38740.yaml#
+$schema: https://devicetree.org/meta-schemas/core.yaml#
+
+title: Infineon TDA38740 and TDA38725 PMBus Synchronous Buck Regulator
+
+description: |
+ The Infineon TDA38740/TDA38725 is a 40A/25A single-voltage synchronous
+ buck regulator with a PMBus interface designed for industrial use.
+
+ Datasheet:
+ https://www.infineon.com/row/public/documents/24/49/infineon-tda38740-tda38725-datasheet-en.pdf
+
+properties:
+ compatible:
+ enum:
+ - infineon,tda38725
+ - infineon,tda38740
+
+ reg:
+ maxItems: 1
+
+ infineon,vout-scale-micro:
+ description: |
+ Scaling factor applied to READ_VOUT telemetry.
+
+ TDA38740/25 pin strap parts are available in two flavors of
+ VOUT_SCALE_LOOP: 1:1 and 1:2.
+
+ For the 1:1 VOUT_SCALE_LOOP version, output voltage sense pins are
+ directly connected to the output, and no resistor divider is used.
+
+ For the 1:2 version, a resistor divider is typically used (for example,
+ 499 ohms for both top and bottom resistors).
+
+ In some designs, users intentionally modify the feedback divider ratio
+ to obtain an output voltage different from the internally configured
+ VBOOT or VOUT value.
+
+ In such cases, the device telemetry (READ_VOUT) continues to report
+ the internally programmed voltage and does not reflect the actual
+ externally adjusted output voltage.
+
+ This property provides a multiplier to scale the reported telemetry
+ value so that the monitoring system reflects the actual output voltage.
+
+ The value shall be expressed in micro units where 1,000,000 represents
+ a scaling factor of 1.0.
+
+ Example:
+ If actual Vout = 0.75V and READ_VOUT reports 0.7V:
+ scaling factor = 0.75 / 0.7 = 1.071
+ value = 1071000
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 100000
+ maximum: 2000000
+
+required:
+ - compatible
+ - reg
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ sensor@40 {
+ compatible = "infineon,tda38740";
+ reg = <0x40>;
+ infineon,vout-scale-micro = <1071000>;
+ };
+ };
+
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/2] hwmon: (pmbus/tda38740) Add driver for Infineon TDA38740/TDA38725
2026-09-07 3:28 [PATCH 0/2] Add driver for Infineon TDA38740/TDA38725 Colin Huang
2026-09-07 3:28 ` [PATCH 1/2] dt-bindings: hwmon: pmbus: Add Infineon tda38740 and tda38725 Colin Huang
@ 2026-09-07 3:28 ` Colin Huang
2026-09-07 3:34 ` sashiko-bot
1 sibling, 1 reply; 5+ messages in thread
From: Colin Huang @ 2026-09-07 3:28 UTC (permalink / raw)
To: Guenter Roeck, Rob Herring, Krzysztof Kozlowski, Conor Dooley
Cc: linux-hwmon, devicetree, linux-kernel, colin.huang2, Colin Huang
From: Colin Huang <u8813345@gmail.com>
Add a PMBus driver for Infineon TDA38740 and TDA38725
single-voltage synchronous buck regulators.
Signed-off-by: Colin Huang <u8813345@gmail.com>
---
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/tda38740.c | 98 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 108 insertions(+)
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index bcfdc4ce4c10..e4ca80dd0574 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -763,6 +763,15 @@ config SENSORS_TDA38640_REGULATOR
If you say yes here you get regulator support for Infineon
TDA38640 as regulator.
+config SENSORS_TDA38740
+ tristate "Infineon TDA38725/TDA38740"
+ help
+ If you say yes here you get hardware monitoring support for Infineon
+ TDA38725 and TDA38740.
+
+ This driver can also be built as a module. If so, the module will
+ be called tda38740.
+
config SENSORS_TPS25990
tristate "TI TPS25990"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index e288fe72a437..eb06d47816fd 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_SENSORS_STEF48H28) += stef48h28.o
obj-$(CONFIG_SENSORS_SQ24860) += sq24860.o
obj-$(CONFIG_SENSORS_STPDDC60) += stpddc60.o
obj-$(CONFIG_SENSORS_TDA38640) += tda38640.o
+obj-$(CONFIG_SENSORS_TDA38740) += tda38740.o
obj-$(CONFIG_SENSORS_TPS25990) += tps25990.o
obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
diff --git a/drivers/hwmon/pmbus/tda38740.c b/drivers/hwmon/pmbus/tda38740.c
new file mode 100644
index 000000000000..4217a5a9ee66
--- /dev/null
+++ b/drivers/hwmon/pmbus/tda38740.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Infineon TDA38725/TDA38740
+ *
+ * Copyright (c) 2023 9elements GmbH
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+struct tda38740_data {
+ struct pmbus_driver_info info;
+};
+
+/*
+ * TDA38725/TDA38740 only support Linear format for VOUT related commands,
+ * with exponents in the range of -8 to -12 (see datasheet VOUT_MODE
+ * description). Direct format is not supported by this device.
+ */
+static int tda38740_identify(struct i2c_client *client,
+ struct pmbus_driver_info *info)
+{
+ int vout_mode;
+
+ vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+ if (vout_mode < 0 || vout_mode == 0xff)
+ return vout_mode < 0 ? vout_mode : -ENODEV;
+
+ if ((vout_mode >> 5) != 0)
+ return -ENODEV;
+
+ info->format[PSC_VOLTAGE_OUT] = linear;
+
+ return 0;
+}
+
+static struct pmbus_driver_info tda38740_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_CURRENT_IN] = linear,
+ .format[PSC_POWER] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+ | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+ | PMBUS_HAVE_IIN
+ | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+ | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+ | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN,
+ .identify = tda38740_identify,
+};
+
+static int tda38740_probe(struct i2c_client *client)
+{
+ struct tda38740_data *data;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ memcpy(&data->info, &tda38740_info, sizeof(tda38740_info));
+
+ return pmbus_do_probe(client, &data->info);
+}
+
+static const struct i2c_device_id tda38740_id[] = {
+ {"tda38725"},
+ {"tda38740"},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, tda38740_id);
+
+static const struct of_device_id __maybe_unused tda38740_of_match[] = {
+ { .compatible = "infineon,tda38725"},
+ { .compatible = "infineon,tda38740"},
+ { },
+};
+MODULE_DEVICE_TABLE(of, tda38740_of_match);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver tda38740_driver = {
+ .driver = {
+ .name = "tda38740",
+ .of_match_table = of_match_ptr(tda38740_of_match),
+ },
+ .probe = tda38740_probe,
+ .id_table = tda38740_id,
+};
+
+module_i2c_driver(tda38740_driver);
+
+MODULE_DESCRIPTION("PMBus driver for Infineon TDA38725/TDA38740");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread