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>

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index db63acbe08c89c3053b3af77e83d9dede3d9738e..8f4bff375ecbc355f5ed3400855c2852ec2aa5ef 100644 (file)
--- 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 63a9870c7b53f414b4a6deceb534a25e8c2cfb65..7129b62bc00f8a2e98de14004997752a856dfda2 100644 (file)
--- 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 (file)
index 0000000..8729a77
--- /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");