i2c: Add support for I2C bus on Freescale CPM1/CPM2 controllers

This driver uses the port of 2.4 code from Vitaly Bordug
<vitb@kernel.crashing.org> and the actual algorithm used by the i2c
driver of the DBox code on cvs.tuxboc.org from Felix Domke
(tmbinc@gmx.net) and Gillem (htoa@gmx.net) converted to an
of_platform_driver. Tested on CPM1 (MPC823 on dbox2 hardware) and
CPM2 (MPC8272).

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/Kconfig

@@ -299,6 +299,16 @@ config I2C_BLACKFIN_TWI_CLK_KHZ
 	help
 	  The unit of the TWI clock is kHz.
 
+config I2C_CPM
+	tristate "Freescale CPM1 or CPM2 (MPC8xx/826x)"
+	depends on (CPM1 || CPM2) && OF_I2C
+	help
+	  This supports the use of the I2C interface on Freescale
+	  processors with CPM1 or CPM2.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called i2c-cpm.
+
 config I2C_DAVINCI
 	tristate "DaVinci I2C driver"
 	depends on ARCH_DAVINCI

drivers/i2c/busses/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_I2C_POWERMAC)	+= i2c-powermac.o
 obj-$(CONFIG_I2C_AT91)		+= i2c-at91.o
 obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
 obj-$(CONFIG_I2C_BLACKFIN_TWI)	+= i2c-bfin-twi.o
+obj-$(CONFIG_I2C_CPM)		+= i2c-cpm.o
 obj-$(CONFIG_I2C_DAVINCI)	+= i2c-davinci.o
 obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o
 obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o