hwmon: (pmbus) Add support for Intel VID protocol VR13

The below lists of VOUT_MODE command readout with their related VID
protocols, Digital to Analog Converter steps:
- VR13.0 mode, 10-mV DAC - 0x24
- VR13.0 mode, 5-mV DAC - 0x27
Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/pmbus.h

@@ -341,7 +341,7 @@ enum pmbus_sensor_classes {
 #define PMBUS_HAVE_STATUS_VMON	BIT(19)
 
 enum pmbus_data_format { linear = 0, direct, vid };
-enum vrm_version { vr11 = 0, vr12 };
+enum vrm_version { vr11 = 0, vr12, vr13 };
 
 struct pmbus_driver_info {
 	int pages;		/* Total number of pages */

drivers/hwmon/pmbus/pmbus_core.c

@@ -557,6 +557,10 @@ static long pmbus_reg2data_vid(struct pmbus_data *data,
 		if (val >= 0x01)
 			rv = 250 + (val - 1) * 5;
 		break;
+	case vr13:
+		if (val >= 0x01)
+			rv = 500 + (val - 1) * 10;
+		break;
 	}
 	return rv;
 }