i2c: ST DDC I2C U300 bus driver v3

This adds support for the ST Microelectronics DDC I2C bus
driver. This bus is used in the U300 architecture recently
added to RMK:s ARM tree.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Reviewed-by: Ben Dooks <ben-linux@fluff.org>
Reviewed-by: Jean Delvare <khali@linus-fr.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 0d04d3e..0e0a390 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -513,6 +513,18 @@
 	  This driver can also be built as a module. If so, the module
 	  will be called i2c-simtec.
 
+config I2C_STU300
+	tristate "ST Microelectronics DDC I2C interface"
+	default y if MACH_U300
+	help
+	  If you say yes to this option, support will be included for the
+	  I2C interface from ST Microelectronics simply called "DDC I2C"
+	  supporting both I2C and DDC, used in e.g. the U300 series
+	  mobile platforms.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called i2c-stu300.
+
 config I2C_VERSATILE
 	tristate "ARM Versatile/Realview I2C bus support"
 	depends on ARCH_VERSATILE || ARCH_REALVIEW