Hi Ken,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v4.16-rc4]
[also build test ERROR on next-20180319]
[cannot apply to linux/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ken-Chen/drivers-i2c-master-arbiter-create-driver/20180320-134925
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> drivers/i2c/muxes/i2c-mux-pca9641.c:23:10: fatal error: linux/i2c/pca954x.h: No such file or directory
    #include <linux/i2c/pca954x.h>
             ^~~~~~~~~~~~~~~~~~~~~
   compilation terminated.

vim +23 drivers/i2c/muxes/i2c-mux-pca9641.c

    22	
  > 23	#include <linux/i2c/pca954x.h>
    24	

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