diff --git a/Documentation/hwmon/pmbus b/Documentation/hwmon/pmbus
index c2b157ba9006e5ac8a8ca45e77ba53649c2d846f..f90f99920cc5ea49664aa1c6ed334f1619cbd94c 100644
--- a/Documentation/hwmon/pmbus
+++ b/Documentation/hwmon/pmbus
@@ -15,13 +15,14 @@ Supported chips:
 	http://www.onsemi.com/pub_link/Collateral/NCP4200-D.PDF
 	http://www.onsemi.com/pub_link/Collateral/JUNE%202009-%20REV.%200.PDF
   * Lineage Power
-    Prefixes: 'pdt003', 'pdt006', 'pdt012', 'udt020'
+    Prefixes: 'mdt040', 'pdt003', 'pdt006', 'pdt012', 'udt020'
     Addresses scanned: -
     Datasheets:
 	http://www.lineagepower.com/oem/pdf/PDT003A0X.pdf
 	http://www.lineagepower.com/oem/pdf/PDT006A0X.pdf
 	http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf
 	http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf
+	http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf
   * Texas Instruments TPS40400, TPS40422
     Prefixes: 'tps40400', 'tps40422'
     Addresses scanned: -
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 7968c815f4433641abe266ce9002f7377888a033..d1aa2dbd5b75a07be03d86e827fc198ff4aea8df 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -20,7 +20,8 @@ config SENSORS_PMBUS
 	help
 	  If you say yes here you get hardware monitoring support for generic
 	  PMBus devices, including but not limited to ADP4000, BMR453, BMR454,
-	  NCP4200, NCP4208, TPS40400, and TPS40422.
+	  MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, TPS40400,
+	  and TPS40422.
 
 	  This driver can also be built as a module. If so, the module will
 	  be called pmbus.
diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
index 7d5161dd04f0d6e841fcd8fb71ebb1cf4f90f100..7e91700131a7e267c1c9c5c471b55f5a477b01fc 100644
--- a/drivers/hwmon/pmbus/pmbus.c
+++ b/drivers/hwmon/pmbus/pmbus.c
@@ -185,6 +185,7 @@ static const struct i2c_device_id pmbus_id[] = {
 	{"adp4000", 1},
 	{"bmr453", 1},
 	{"bmr454", 1},
+	{"mdt040", 1},
 	{"ncp4200", 1},
 	{"ncp4208", 1},
 	{"pdt003", 1},