i2c: riic: add driver

Tested with a r7s72100 genmai board acessing an eeprom.

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3b26129..8e8332d 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -648,6 +648,16 @@
 	  is necessary for systems where the PXA may be a target on the
 	  I2C bus.
 
+config I2C_RIIC
+	tristate "Renesas RIIC adapter"
+	depends on ARCH_SHMOBILE || COMPILE_TEST
+	help
+	  If you say yes to this option, support will be included for the
+	  Renesas RIIC I2C interface.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-riic.
+
 config HAVE_S3C2410_I2C
 	bool
 	help