Hi Stefan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20220120] [also build test WARNING 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: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20220121/202201210109.tNnI8P2j-lk...) compiler: alpha-linux-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/684295c62acdefb3fab20a0e7633793ba... 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 684295c62acdefb3fab20a0e7633793ba748c6d7 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash drivers/char/tpm/st33zp24/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/char/tpm/st33zp24/spi.c:8: include/linux/spi/spi.h:772:1: error: expected identifier or '(' before '{' token 772 | { | ^ 776 | int acpi_spi_count_resources(struct acpi_device *adev) | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/spi/spi.h:769:34: warning: 'acpi_spi_device_alloc' declared 'static' but never defined [-Wunused-function] 769 | static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, | ^~~~~~~~~~~~~~~~~~~~~ drivers/char/tpm/st33zp24/spi.c:408:36: warning: 'st33zp24_spi_acpi_match' defined but not used [-Wunused-const-variable=] 408 | static const struct acpi_device_id st33zp24_spi_acpi_match[] = { | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/acpi_spi_count_resources +776 include/linux/spi/spi.h 775 777 { 778 return -EOPNOTSUPP; 779 } 780 #endif 781 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org