ld.lld: error: undefined symbol: devm_mux_control_get

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   09162bc32c880a791c6c0668ce0745cf7958f576
commit: abf00907538e21c469a10809dc2991982673fcbf spi: dw: Add Baikal-T1 SPI Controller glue driver
date:   6 weeks ago
config: x86_64-randconfig-r014-20201116 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9a85643cd357e412cff69067bb5c4840e228c2ab)

reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abf00907538e21c469a10809dc2991982673fcbf
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout abf00907538e21c469a10809dc2991982673fcbf
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: devm_mux_control_get
   >>> referenced by spi-dw-bt1.c
   >>> spi/spi-dw-bt1.o:(dw_spi_bt1_sys_init) in archive drivers/built-in.a

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org