dln2-adc.c:undefined reference to `devm_iio_triggered_buffer_setup'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e365806ac289457263a133bd32df8df49897f612
commit: 7c0299e879dd3c3fe0885fc07233b28f6007add3 iio: adc: Add support for DLN2 ADC
date:   3 months ago
config: x86_64-randconfig-ne0-09270223 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 7c0299e879dd3c3fe0885fc07233b28f6007add3
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `dln2_adc_probe':
>> dln2-adc.c:(.text+0x1ab3d3): undefined reference to `devm_iio_triggered_buffer_setup'

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