i2c: mxc: move to new subsystem

Signed-off-by: Philippe Reynes <tremyfr@yahoo.fr>
diff --git a/README b/README
index 09662a4..7dc4f23 100644
--- a/README
+++ b/README
@@ -2003,6 +2003,17 @@
 		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
 		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
 
+		- drivers/i2c/i2c_mxc.c
+		  - activate this driver with CONFIG_SYS_I2C_MXC
+		  - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED
+		  - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE
+		  - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED
+		  - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE
+		  - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED
+		  - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE
+		If thoses defines are not set, default value is 100000
+		for speed, and 0 for slave.
+
 		additional defines:
 
 		CONFIG_SYS_NUM_I2C_BUSES