hwmon:(pmbus/xdp720) Add support for efuse xdp720

Add the pmbus driver for Infineon XDP720 Digital eFuse Controller.

Signed-off-by: Ashish Yadav <ashish.yadav@infineon.com>
Link: https://lore.kernel.org/r/20260410070154.3313-3-Ashish.Yadav@infineon.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 138 insertions, 0 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index db63acbe08c8..8f4bff375ecb 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -711,6 +711,15 @@ config SENSORS_XDP710
 	  This driver can also be built as a module. If so, the module will
 	  be called xdp710.
 
+config SENSORS_XDP720
+	tristate "Infineon XDP720 family"
+	help
+	  If you say yes here you get hardware monitoring support for Infineon
+	  XDP720.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called xdp720.
+
 config SENSORS_XDPE152
 	tristate "Infineon XDPE152 family"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 63a9870c7b53..7129b62bc00f 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_SENSORS_TPS546D24)	+= tps546d24.o
 obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
 obj-$(CONFIG_SENSORS_XDP710)	+= xdp710.o
+obj-$(CONFIG_SENSORS_XDP720)	+= xdp720.o
 obj-$(CONFIG_SENSORS_XDPE122)	+= xdpe12284.o
 obj-$(CONFIG_SENSORS_XDPE152)	+= xdpe152c4.o
 obj-$(CONFIG_SENSORS_XDPE1A2G7B)	+= xdpe1a2g7b.o
diff --git a/drivers/hwmon/pmbus/xdp720.c b/drivers/hwmon/pmbus/xdp720.c
new file mode 100644
index 000000000000..8729a771f216
--- /dev/null
+++ b/drivers/hwmon/pmbus/xdp720.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Infineon XDP720 Digital eFuse Controller
+ *
+ * Copyright (c) 2026 Infineon Technologies. All rights reserved.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of_device.h>
+#include <linux/bitops.h>
+#include <linux/math64.h>
+#include "pmbus.h"
+
+/*
+ * The IMON resistor required to generate the system overcurrent protection.
+ * Arbitrary default Rimon value: 2k Ohm
+ */
+#define XDP720_DEFAULT_RIMON 2000000000 /* 2k ohm */
+#define XDP720_TELEMETRY_AVG 0xE9
+
+static struct pmbus_driver_info xdp720_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+
+	.m[PSC_VOLTAGE_IN] = 4653,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = -2,
+	.m[PSC_VOLTAGE_OUT] = 4653,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = -2,
+	/*
+	 * Current and Power measurement depends on the RIMON (kOhm) and
+	 * GIMON(microA/A) values.
+	 */
+	.m[PSC_CURRENT_OUT] = 24668,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = -4,
+	.m[PSC_POWER] = 4486,
+	.b[PSC_POWER] = 0,
+	.R[PSC_POWER] = -1,
+	.m[PSC_TEMPERATURE] = 54,
+	.b[PSC_TEMPERATURE] = 22521,
+	.R[PSC_TEMPERATURE] = -1,
+
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
+		   PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_INPUT |
+		   PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int xdp720_probe(struct i2c_client *client)
+{
+	struct pmbus_driver_info *info;
+	int ret;
+	u32 rimon;
+	int gimon;
+
+	info = devm_kmemdup(&client->dev, &xdp720_info, sizeof(*info),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	ret = devm_regulator_get_enable(&client->dev, "vdd-vin");
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+			"failed to enable vdd-vin supply\n");
+
+	ret = i2c_smbus_read_word_data(client, XDP720_TELEMETRY_AVG);
+	if (ret < 0) {
+		dev_err(&client->dev, "Can't get TELEMETRY_AVG\n");
+		return ret;
+	}
+
+	ret >>= 10; /* 10th bit of TELEMETRY_AVG REG for GIMON Value */
+	ret &= GENMASK(0, 0);
+	if (ret == 1)
+		gimon = 18200; /* output gain 18.2 microA/A */
+	else
+		gimon = 9100; /* output gain 9.1 microA/A */
+
+	if (of_property_read_u32(client->dev.of_node,
+				 "infineon,rimon-micro-ohms", &rimon))
+		rimon = XDP720_DEFAULT_RIMON; /* Default if not set via DT */
+	if (rimon == 0)
+		return -EINVAL;
+
+	/* Adapt the current and power scale for each instance */
+	info->m[PSC_CURRENT_OUT] = DIV64_U64_ROUND_CLOSEST((u64)
+		info->m[PSC_CURRENT_OUT] * rimon * gimon, 1000000000000ULL);
+	info->m[PSC_POWER] = DIV64_U64_ROUND_CLOSEST((u64)
+		info->m[PSC_POWER] * rimon * gimon, 1000000000000000ULL);
+
+	return pmbus_do_probe(client, info);
+}
+
+static const struct of_device_id xdp720_of_match[] = {
+	{ .compatible = "infineon,xdp720" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, xdp720_of_match);
+
+static const struct i2c_device_id xdp720_id[] = {
+	{ "xdp720" },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, xdp720_id);
+
+static struct i2c_driver xdp720_driver = {
+	.driver = {
+		   .name = "xdp720",
+		   .of_match_table = xdp720_of_match,
+	},
+	.probe = xdp720_probe,
+	.id_table = xdp720_id,
+};
+
+module_i2c_driver(xdp720_driver);
+
+MODULE_AUTHOR("Ashish Yadav <ashish.yadav@infineon.com>");
+MODULE_DESCRIPTION("PMBus driver for Infineon XDP720 Digital eFuse Controller");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("PMBUS");