Hi Richard,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to ljones-mfd/for-mfd-next asoc/for-next v4.14]
[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/Richard-Fitzgerald/Add-support-for-Cirrus-Logic-CS47L35-L85-L90-L91-codecs/20171126-145824
config: arm64-allmodconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All errors (new ones prefixed by >>):

   drivers/mfd/madera-i2c.o: In function `madera_i2c_probe':

quoted

madera-i2c.c:(.text+0x208): undefined reference to `__devm_regmap_init_i2c'

   madera-i2c.c:(.text+0x24c): undefined reference to `__devm_regmap_init_i2c'
   drivers/mfd/madera-i2c.o: In function `madera_i2c_driver_init':

quoted

madera-i2c.c:(.init.text+0x20): undefined reference to `i2c_register_driver'

   drivers/mfd/madera-i2c.o: In function `madera_i2c_driver_exit':

quoted

madera-i2c.c:(.exit.text+0x14): undefined reference to `i2c_del_driver'

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