Hi Nikolaus,

[auto build test ERROR on input/next]
[also build test ERROR on v4.3 next-20151106]

url:    https://github.com/0day-ci/linux/commits/H-Nikolaus-Schaller/drivers-touchscreen-tsc2007-and-ads7846-tsc2046-improvements-use-common-touchscreen-bindings-pre-calibration-spi-fix-and-provide-iio-raw-values/20151106-231936
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: x86_64-randconfig-s2-11062316 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `tsc2007_remove':

quoted

tsc2007.c:(.text+0x23a2a6): undefined reference to `iio_device_unregister'

   drivers/built-in.o: In function `tsc2007_probe':

quoted

tsc2007.c:(.text+0x23a3bf): undefined reference to `devm_iio_device_alloc'
tsc2007.c:(.text+0x23a436): undefined reference to `iio_device_register'

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