[PATCH 2/2] hwmon:(pmbus/xdpe1a2g7b) Add support for xdpe1a2g5b/7b controllers
From: ASHISH YADAV
Date: Mon Feb 02 2026 - 03:11:19 EST
From: Ashish Yadav <ashish.yadav@xxxxxxxxxxxx>
Add the pmbus driver for Infineon Digital Multi-phase XDPE1A2G5B and
XDPE1A2G7B controllers.
XDPE1A2G5B controller supports Linear Data format for VOUT using VOUT_MODE
command.
XDPE1A2G7B controller supports Linear and VID Data format for VOUT using
VOUT_MODE command.
In case of vid mode in XDPE1A2G7B controller, NVIDIA PWM VID vrm_version
is supported:
Vout = 5mV * (VID-1) + 195mV
Signed-off-by: Ashish Yadav <ashish.yadav@xxxxxxxxxxxx>
---
drivers/hwmon/pmbus/Kconfig | 9 +++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/pmbus.h | 2 +-
drivers/hwmon/pmbus/pmbus_core.c | 4 ++
drivers/hwmon/pmbus/xdpe1a2g7b.c | 115 +++++++++++++++++++++++++++++++
5 files changed, 130 insertions(+), 1 deletion(-)
create mode 100644 drivers/hwmon/pmbus/xdpe1a2g7b.c
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index f3fb94cebf1a..c6750bce446d 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -684,6 +684,15 @@ config SENSORS_XDPE152
This driver can also be built as a module. If so, the module will
be called xdpe152c4.
+config SENSORS_XDPE1A2G7B
+ tristate "Infineon XDPE1A2G7B"
+ help
+ If you say yes here you get hardware monitoring support for Infineon
+ XDPE1A2G5B and XDPE1A2G7B.
+
+ This driver can also be built as a module. If so, the module will
+ be called xdpe1a2g7b.
+
config SENSORS_XDPE122
tristate "Infineon XDPE122 family"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 349a89b6d92e..620f24baa289 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
obj-$(CONFIG_SENSORS_XDP710) += xdp710.o
obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o
obj-$(CONFIG_SENSORS_XDPE152) += xdpe152c4.o
+obj-$(CONFIG_SENSORS_XDPE1A2G7B) += xdpe1a2g7b.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o
obj-$(CONFIG_SENSORS_PIM4328) += pim4328.o
obj-$(CONFIG_SENSORS_CRPS) += crps.o
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index d2e9bfb5320f..3ddcb742d289 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -416,7 +416,7 @@ enum pmbus_sensor_classes {
#define PMBUS_PAGE_VIRTUAL BIT(31) /* Page is virtual */
enum pmbus_data_format { linear = 0, ieee754, direct, vid };
-enum vrm_version { vr11 = 0, vr12, vr13, imvp9, amd625mv };
+enum vrm_version { vr11 = 0, vr12, vr13, imvp9, amd625mv, nvidia195mv };
/* PMBus revision identifiers */
#define PMBUS_REV_10 0x00 /* PMBus revision 1.0 */
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index be6d05def115..4d7634ee6148 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -885,6 +885,10 @@ static s64 pmbus_reg2data_vid(struct pmbus_data *data,
if (val >= 0x0 && val <= 0xd8)
rv = DIV_ROUND_CLOSEST(155000 - val * 625, 100);
break;
+ case nvidia195mv:
+ if (val >= 0x01)
+ rv = 195 + (val - 1) * 5; /* VID step is 5mv */
+ break;
}
return rv;
}
diff --git a/drivers/hwmon/pmbus/xdpe1a2g7b.c b/drivers/hwmon/pmbus/xdpe1a2g7b.c
new file mode 100644
index 000000000000..79b12b56e7b6
--- /dev/null
+++ b/drivers/hwmon/pmbus/xdpe1a2g7b.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Infineon Multi-phase Digital XDPE1A2G5B
+ * and XDPE1A2G7B Controllers
+ *
+ * Copyright (c) 2026 Infineon Technologies. All rights reserved.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include "pmbus.h"
+
+#define XDPE1A2G7B_PAGE_NUM 2
+#define XDPE1A2G7B_NVIDIA_195MV 0x1E /* NVIDIA mode 1.95mV, VID step is 5mV */
+
+static int xdpe1a2g7b_identify(struct i2c_client *client,
+ struct pmbus_driver_info *info)
+{
+ u8 vout_params;
+ int i, ret, vout_mode;
+
+ vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+ if (vout_mode >= 0 && vout_mode != 0xff) {
+ switch (vout_mode >> 5) {
+ case 0:
+ info->format[PSC_VOLTAGE_OUT] = linear;
+ return 0;
+ case 1:
+ info->format[PSC_VOLTAGE_OUT] = vid;
+ break;
+ default:
+ return -ENODEV;
+ }
+ }
+
+ for (i = 0; i < info->pages; i++) {
+ /* Read the VOUT_MODE register for VID Code Type. */
+ ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
+ if (ret < 0)
+ return ret;
+
+ vout_params = ret & GENMASK(4, 0);
+ switch (vout_params) {
+ case XDPE1A2G7B_NVIDIA_195MV:
+ info->vrm_version[i] = nvidia195mv;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static struct pmbus_driver_info xdpe1a2g7b_info = {
+ .pages = XDPE1A2G7B_PAGE_NUM,
+ .identify = xdpe1a2g7b_identify,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .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_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP |
+ PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
+ .func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_STATUS_INPUT,
+};
+
+static int xdpe1a2g7b_probe(struct i2c_client *client)
+{
+ struct pmbus_driver_info *info;
+
+ info = devm_kmemdup(&client->dev, &xdpe1a2g7b_info, sizeof(*info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ return pmbus_do_probe(client, info);
+}
+
+static const struct i2c_device_id xdpe1a2g7b_id[] = { { "xdpe1a2g5b" },
+ { "xdpe1a2g7b" },
+ {} };
+
+MODULE_DEVICE_TABLE(i2c, xdpe1a2g7b_id);
+
+static const struct of_device_id __maybe_unused xdpe1a2g7b_of_match[] = {
+ { .compatible = "infineon,xdpe1a2g5b" },
+ { .compatible = "infineon,xdpe1a2g7b" },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, xdpe1a2g7b_of_match);
+
+static struct i2c_driver xdpe1a2g7b_driver = {
+ .driver = {
+ .name = "xdpe1a2g7b",
+ .of_match_table = of_match_ptr(xdpe1a2g7b_of_match),
+ },
+ .probe = xdpe1a2g7b_probe,
+ .id_table = xdpe1a2g7b_id,
+};
+
+module_i2c_driver(xdpe1a2g7b_driver);
+
+MODULE_AUTHOR("Ashish Yadav <ashish.yadav@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for Infineon XDPE1A2G5B/7B");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");
--
2.39.5