hwmon: (pmbus/mp5990) add support for MP5998

Add support for the MPS MP5998 hot-swap controller. Like MP5990, MP5998
uses EFUSE_CFG (0xC4) bit 9 to indicate linear/direct data format.

Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com>
Link: https://lore.kernel.org/r/20250916095026.800164-2-chou.cosmo@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/mp5990.rst

@@ -9,9 +9,13 @@ Supported chips:
 
     Prefix: 'mp5990'
 
-  * Datasheet
+    Datasheet: Publicly available at the MPS website: https://www.monolithicpower.com/en/mp5990.html
 
-    Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5990.html
+  * MPS MP5998
+
+    Prefix: 'mp5998'
+
+    Datasheet: Not publicly available
 
 Author:
 
@@ -21,7 +25,7 @@ Description
 -----------
 
 This driver implements support for Monolithic Power Systems, Inc. (MPS)
-MP5990 Hot-Swap Controller.
+MP5990 and MP5998 Hot-Swap Controller.
 
 Device compliant with:
 
@@ -53,7 +57,7 @@ The driver provides the following attributes for output voltage:
 
 **in2_alarm**
 
-The driver provides the following attributes for output current:
+The driver provides the following attributes for current:
 
 **curr1_input**
 
@@ -63,6 +67,14 @@ The driver provides the following attributes for output current:
 
 **curr1_max**
 
+**curr2_input**
+
+**curr2_label**
+
+**curr2_max**
+
+**curr2_max_alarm**
+
 The driver provides the following attributes for input power:
 
 **power1_input**
@@ -71,6 +83,16 @@ The driver provides the following attributes for input power:
 
 **power1_alarm**
 
+The driver provides the following attributes for output power:
+
+**power2_input**
+
+**power2_label**
+
+**power2_max**
+
+**power2_max_alarm**
+
 The driver provides the following attributes for temperature:
 
 **temp1_input**

drivers/hwmon/pmbus/mp5990.c

@@ -8,6 +8,8 @@
 #include <linux/of_device.h>
 #include "pmbus.h"
 
+enum chips { mp5990, mp5998 };
+
 #define MP5990_EFUSE_CFG	(0xC4)
 #define MP5990_VOUT_FORMAT	BIT(9)
 
@@ -110,10 +112,53 @@ static struct pmbus_driver_info mp5990_info = {
 	.read_word_data = mp5990_read_word_data,
 };
 
+static struct pmbus_driver_info mp5998_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = direct,
+	.format[PSC_VOLTAGE_OUT] = direct,
+	.format[PSC_CURRENT_IN] = direct,
+	.format[PSC_CURRENT_OUT] = direct,
+	.format[PSC_POWER] = direct,
+	.format[PSC_TEMPERATURE] = direct,
+	.m[PSC_VOLTAGE_IN] = 64,
+	.b[PSC_VOLTAGE_IN] = 0,
+	.R[PSC_VOLTAGE_IN] = 0,
+	.m[PSC_VOLTAGE_OUT] = 64,
+	.b[PSC_VOLTAGE_OUT] = 0,
+	.R[PSC_VOLTAGE_OUT] = 0,
+	.m[PSC_CURRENT_IN] = 16,
+	.b[PSC_CURRENT_IN] = 0,
+	.R[PSC_CURRENT_IN] = 0,
+	.m[PSC_CURRENT_OUT] = 16,
+	.b[PSC_CURRENT_OUT] = 0,
+	.R[PSC_CURRENT_OUT] = 0,
+	.m[PSC_POWER] = 2,
+	.b[PSC_POWER] = 0,
+	.R[PSC_POWER] = 0,
+	.m[PSC_TEMPERATURE] = 1,
+	.b[PSC_TEMPERATURE] = 0,
+	.R[PSC_TEMPERATURE] = 0,
+	.func[0] =
+		PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
+		PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+		PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_IOUT |
+		PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+	.read_byte_data = mp5990_read_byte_data,
+	.read_word_data = mp5990_read_word_data,
+};
+
+static const struct i2c_device_id mp5990_id[] = {
+	{"mp5990", mp5990},
+	{"mp5998", mp5998},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mp5990_id);
+
 static int mp5990_probe(struct i2c_client *client)
 {
 	struct pmbus_driver_info *info;
 	struct mp5990_data *data;
+	enum chips chip;
 	int ret;
 
 	data = devm_kzalloc(&client->dev, sizeof(struct mp5990_data),
@@ -121,7 +166,15 @@ static int mp5990_probe(struct i2c_client *client)
 	if (!data)
 		return -ENOMEM;
 
+	if (client->dev.of_node)
+		chip = (uintptr_t)of_device_get_match_data(&client->dev);
+	else
+		chip = i2c_match_id(mp5990_id, client)->driver_data;
+
+	if (chip == mp5990)
 		memcpy(&data->info, &mp5990_info, sizeof(*info));
+	else
+		memcpy(&data->info, &mp5998_info, sizeof(*info));
 	info = &data->info;
 
 	/* Read Vout Config */
@@ -140,6 +193,9 @@ static int mp5990_probe(struct i2c_client *client)
 		data->info.format[PSC_VOLTAGE_OUT] = linear;
 		data->info.format[PSC_CURRENT_OUT] = linear;
 		data->info.format[PSC_POWER] = linear;
+		if (chip == mp5998)
+			data->info.format[PSC_CURRENT_IN] = linear;
+
 		ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
 		if (ret < 0) {
 			dev_err(&client->dev, "Can't get vout exponent.");
@@ -153,16 +209,11 @@ static int mp5990_probe(struct i2c_client *client)
 }
 
 static const struct of_device_id mp5990_of_match[] = {
-	{ .compatible = "mps,mp5990" },
+	{ .compatible = "mps,mp5990", .data = (void *)mp5990 },
+	{ .compatible = "mps,mp5998", .data = (void *)mp5998 },
 	{}
 };
 
-static const struct i2c_device_id mp5990_id[] = {
-	{"mp5990"},
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, mp5990_id);
-
 static struct i2c_driver mp5990_driver = {
 	.driver = {
 		   .name = "mp5990",