[PATCH v3 3/3] hwmon:(pmbus/xdpe1a2g7b) Add support for xdpe1a2g5b/7b controllers

[ASHISH YADAV]

From: Ashish Yadav <ashish.yadav@xxxxxxxxxxxx>

Add the pmbus driver for Infineon Digital Multi-phase XDPE1A2G5B and
XDPE1A2G7B controllers.

Signed-off-by: Ashish Yadav <ashish.yadav@xxxxxxxxxxxx>
---
XDPE1A2G5B and XDPE1A2G7B support both Linear and NVIDIA PWM VID Data
formats for VOUT_MODE.
The configuring both loops/pages of the device independently is not
supported for VOUT_MODE.
In case of vid mode, NVIDIA PWM VID vrm_version is supported:
Vout = 5mV * (VID-1) + 195mV
---
 drivers/hwmon/pmbus/Kconfig      |   9 +++
 drivers/hwmon/pmbus/Makefile     |   1 +
 drivers/hwmon/pmbus/xdpe1a2g7b.c | 119 +++++++++++++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/xdpe1a2g7b.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index fc1273abe357..a4513fc6bc26 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -711,6 +711,15 @@ 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 d6c86924f887..d592d8c77bec 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -70,6 +70,7 @@ 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/xdpe1a2g7b.c b/drivers/hwmon/pmbus/xdpe1a2g7b.c
new file mode 100644
index 000000000000..1755e3522ede
--- /dev/null
+++ b/drivers/hwmon/pmbus/xdpe1a2g7b.c
@@ -0,0 +1,119 @@
+// 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 vout_mode;
+
+	/*
+	 * XDPE1A2G5B and XDPE1A2G7B support both Linear and NVIDIA PWM VID data
+	 * formats via VOUT_MODE. Note that the device pages/loops are not fully
+	 * independent: configuration is shared, so programming each page/loop
+	 * separately is not supported.
+	 */
+	vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+	if (vout_mode < 0)
+		return vout_mode;
+
+	switch (vout_mode >> 5) {
+	case 0:
+		info->format[PSC_VOLTAGE_OUT] = linear;
+		return 0;
+	case 1:
+		info->format[PSC_VOLTAGE_OUT] = vid;
+		vout_params = vout_mode & GENMASK(4, 0);
+		/* Check for VID Code Type */
+		switch (vout_params) {
+		case XDPE1A2G7B_NVIDIA_195MV:
+			/* VID vrm_version for PAGE0 and PAGE1 */
+			info->vrm_version[0] = nvidia195mv;
+			info->vrm_version[1] = nvidia195mv;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	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