ARM: OMAP: Add command line option for I2C bus speed, v2

This patch adds a new command line option "i2c_bus=bus_id,clkrate" into
I2C bus registration helper. Purpose of the option is to override the
default board specific bus speed which is supplied by the
omap_register_i2c_bus.

The default bus speed is typically set to speed of slowest I2C chip on the
bus and overriding allow to use some experimental configurations or updated
chip versions without any kernel modifications.

Cc: linux-i2c@vger.kernel.org
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 54f21a5c262b..d775076d1563 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -830,6 +830,10 @@ and is between 256 and 4096 characters. It is defined in the file
         hvc_iucv=       [S390] Number of z/VM IUCV hypervisor console (HVC)
                                terminal devices. Valid values: 0..8
 
+        i2c_bus=        [HW] Override the default board specific I2C bus speed
+                             Format:
+                             <bus_id>,<clkrate>
+
         i8042.debug     [HW] Toggle i8042 debug mode
         i8042.direct    [HW] Put keyboard port into non-translated mode
         i8042.dumbkbd   [HW] Pretend that controller can only read data from