ARM: OMAP: Add method to register additional I2C busses on the command line, v2

This patch extends command line option "i2c_bus=bus_id,clkrate" so that
it allow to register additional I2C busses that are not registered with
omap_register_i2c_bus from board initialization code.

Purpose of this is to register additional board busses which are routed
to external connectors only without any on board I2C devices.

Cc: linux-i2c@vger.kernel.org
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index d775076..ef9827f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -831,6 +831,8 @@
 			       terminal devices. Valid values: 0..8
 
 	i2c_bus=	[HW] Override the default board specific I2C bus speed
+			     or register an additional I2C bus that is not
+			     registered from board initialization code.
 			     Format:
 			     <bus_id>,<clkrate>