mfd: Add mc13xxx i2c driver

Adds support for mc13xxx family ICs connected via i2c.

Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
Acked-by: Oskar Schirmer <oskar@scara.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9c8294c..ef86a74 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -597,7 +597,7 @@
 
 config MFD_MC13XXX
 	tristate "Support Freescale MC13783 and MC13892"
-	depends on SPI_MASTER
+	depends on SPI_MASTER || I2C
 	select MFD_CORE
 	select MFD_MC13783
 	help
@@ -615,6 +615,13 @@
 	help
 	  Select this if your MC13xxx is connected via an SPI bus.
 
+config MFD_MC13XXX_I2C
+	tristate "MC13xxx I2C interface" if I2C
+	default I2C
+	select REGMAP_I2C
+	help
+	  Select this if your MC13xxx is connected via an I2C bus.
+
 endif
 
 config ABX500_CORE