hwmon: (pmbus) Add tps40422 front-end driver

For TI power management chip TPS40422, READ_TEMPERATURE_2 command is supported on
page 1 of the chip, but the original driver(pmbus.c) only tried to detect this command
on page 0, this will lead to a result that the temperature sensor in page 1 couldn't
be detected. This change is to isolate the tps40422 driver from pmbus.c into a solo
front-end driver.

Signed-off-by: Zhu Laiwen <richard.zhu@nsn.com>
[Guenter Roeck: Dropped unnecessary license text (fixes checkpatch warning)]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 39cc63e..6e1e493 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -20,8 +20,7 @@
 	help
 	  If you say yes here you get hardware monitoring support for generic
 	  PMBus devices, including but not limited to ADP4000, BMR453, BMR454,
-	  MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, TPS40400,
-	  and TPS40422.
+	  MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, and TPS40400.
 
 	  This driver can also be built as a module. If so, the module will
 	  be called pmbus.
@@ -87,6 +86,16 @@
 	  This driver can also be built as a module. If so, the module will
 	  be called max8688.
 
+config SENSORS_TPS40422
+	tristate "TI TPS40422"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for TI
+	  TPS40422.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tps40422.
+
 config SENSORS_UCD9000
 	tristate "TI UCD90120, UCD90124, UCD9090, UCD90910"
 	default n