dw-hdmi.c:undefined reference to `__devm_regmap_init_mmio_clk'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   eb4125dfdb1f64a5e41da8315bff48f67e5d1712
commit: 40d0fa7095d06c73c33da4fa7e381350141682f5 drm: rcar-du: Add Gen3 HDMI 
encoder support
date:   10 weeks ago
config: x86_64-randconfig-u0-06101124 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 40d0fa7095d06c73c33da4fa7e381350141682f5
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `__dw_hdmi_probe':
>> dw-hdmi.c:(.text+0xf0256): undefined reference to 
>> `__devm_regmap_init_mmio_clk'

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.config.gz
Description: application/gzip