Hi Stefan, Thank you for the patch! Yet something to improve: [auto build test ERROR on next-20220120] [also build test ERROR on v5.16] [cannot apply to broonie-spi/for-next rafael-pm/linux-next tiwai-sound/for-next linus/master v5.16 v5.16-rc8 v5.16-rc7] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Stefan-Binding/Support-Spi-in-i2... base: 7fc5253f5a13271e9df35d6b936ff97b74540a59 config: riscv-randconfig-r042-20220120 (https://download.01.org/0day-ci/archive/20220121/202201210136.gwZmTll9-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/aedf84002ec1568907471591915e28bed... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Stefan-Binding/Support-Spi-in-i2c-multi-instantiate-driver/20220120-214608 git checkout aedf84002ec1568907471591915e28bed40e8f9a # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/rtc/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/rtc/rtc-rv3029c2.c:13: { ^ 1 error generated. vim +769 include/linux/spi/spi.h 762 763 #if IS_ENABLED(CONFIG_ACPI) 764 extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, 765 struct acpi_device *adev); 766 #else 767 static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, 768 struct acpi_device *adev); 770 return ERR_PTR(-EOPNOTSUPP); 771 } 772 #endif 773 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org