pinctrl-sprd-sc9860.c:undefined reference to `sprd_pinctrl_core_probe'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ad9a19d003703ae06a6e8efc64cf26a939d9e84d
commit: 41d32cfce1ae616413761d07986e1fb4b907e808 pinctrl: sprd: Add Spreadtrum pin control driver
date:   10 days ago
config: x86_64-randconfig-x005-201737 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 41d32cfce1ae616413761d07986e1fb4b907e808
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/pinctrl/sprd/pinctrl-sprd-sc9860.o: In function `sprd_pinctrl_probe':
>> pinctrl-sprd-sc9860.c:(.text+0x31): undefined reference to `sprd_pinctrl_core_probe'
>> drivers/pinctrl/sprd/pinctrl-sprd-sc9860.o:(.data+0x8): undefined reference to `sprd_pinctrl_remove'
>> drivers/pinctrl/sprd/pinctrl-sprd-sc9860.o:(.data+0x10): undefined reference to `sprd_pinctrl_shutdown'

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