i2c: Multiplexed I2C bus core support

Add multiplexed bus core support. I2C multiplexer and switches
like pca954x get instantiated as new adapters per port.

Signed-off-by: Michael Lawnick <ml.lawnick@gmx.de>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index d06083fdffbb..efb48ad1ba34 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -47,6 +47,17 @@ config I2C_CHARDEV
           This support is also available as a module.  If so, the module 
           will be called i2c-dev.
 
+config I2C_MUX
+        tristate "I2C bus multiplexing support"
+        depends on EXPERIMENTAL
+        help
+          Say Y here if you want the I2C core to support the ability to
+          handle multiplexed I2C bus topologies, by presenting each
+          multiplexed segment as a I2C adapter.
+
+          This support is also available as a module.  If so, the module
+          will be called i2c-mux.
+
 config I2C_HELPER_AUTO
         bool "Autoselect pertinent helper modules"
         default y