iio: Add Melexis mlx90614 contact-less infrared temperature sensor driver

I2C-controlled sensor measures ambient and object temperatuer

see
http://www.melexis.com/Infrared-Thermometer-Sensors/Infrared-Thermometer-Sensors/MLX90614-615.aspx

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index 372f8fb..21feaa4 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -3,6 +3,16 @@
 #
 menu "Temperature sensors"
 
+config MLX90614
+	tristate "MLX90614 contact-less infrared sensor"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Melexis
+	  MLX90614 contact-less infrared sensor connected with I2C.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called mlx90614.
+
 config TMP006
 	tristate "TMP006 infrared thermopile sensor"
 	depends on I2C