i2c: Add driver for SMBus Control Method Interface

This driver supports the SMBus Control Method Interface. It needs BIOS declare
ACPI control methods which described in SMBus Control Method Interface Spec.
http://smbus.org/specs/smbus_cmi10.pdfSigned-off-by: Crane Cai <crane.cai@amd.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/Kconfig

@@ -762,4 +762,15 @@ config SCx200_ACB
 	  This support is also available as a module.  If so, the module
 	  will be called scx200_acb.
 
+config I2C_SCMI
+	tristate "SMBus Control Method Interface"
+	depends on ACPI
+	help
+	  This driver supports the SMBus Control Method Interface. It needs the
+	  BIOS to declare ACPI control methods as described in the SMBus Control
+	  Method Interface specification.
+
+	  To compile this driver as a module, choose M here:
+	  the module will be called i2c-scmi.
+
 endmenu

drivers/i2c/busses/Makefile

@@ -2,6 +2,9 @@
 # Makefile for the i2c bus drivers.
 #
 
+# SMBus CMI driver
+obj-$(CONFIG_I2C_SCMI)		+= i2c-scmi.o
+
 # PC SMBus host controller drivers
 obj-$(CONFIG_I2C_ALI1535)	+= i2c-ali1535.o
 obj-$(CONFIG_I2C_ALI1563)	+= i2c-ali1563.o