[PATCH] I2C: Add support for multiple I2C busses for RTC & DTT

This patch switches to the desired I2C bus when the date/dtt
commands are called. This can be configured using the
CFG_RTC_BUS_NUM and/or CFG_DTT_BUS_NUM defines.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/README b/README
index ecfd1f8..1542864 100644
--- a/README
+++ b/README
@@ -1347,6 +1347,16 @@
 		If defined, then this indicates the I2C bus number for DDR SPD.
 		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
 
+		CFG_RTC_BUS_NUM
+
+		If defined, then this indicates the I2C bus number for the RTC.
+		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
+
+		CFG_DTT_BUS_NUM
+
+		If defined, then this indicates the I2C bus number for the DTT.
+		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
+
 		CONFIG_FSL_I2C
 
 		Define this option if you want to use Freescale's I2C driver in