Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.13 next-20210701]
[cannot apply to xlnx/master]
[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/trix-redhat-com/fpga-reorganize-to-subdirs/20210623-040811
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0c18f29aae7ce3dadd26d8ee3505d07cc982df75
config: x86_64-randconfig-a016-20210705 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 3f9bf9f42a9043e20c6d2a74dd4f47a90a7e2b41)
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://github.com/0day-ci/linux/commit/d9e57cd01c49381771481c50a7705262d4980335
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review trix-redhat-com/fpga-reorganize-to-subdirs/20210623-040811
        git checkout d9e57cd01c49381771481c50a7705262d4980335
        # 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
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/fpga/xilinx/xilinx-spi.c:259:34: warning: unused variable 'xlnx_spi_of_match' [-Wunused-const-variable]
   static const struct of_device_id xlnx_spi_of_match[] = {
                                    ^
   1 warning generated.


vim +/xlnx_spi_of_match +259 drivers/fpga/xilinx/xilinx-spi.c

061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  258  
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23 @259  static const struct of_device_id xlnx_spi_of_match[] = {
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  260  	{ .compatible = "xlnx,fpga-slave-serial", },
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  261  	{}
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  262  };
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  263  MODULE_DEVICE_TABLE(of, xlnx_spi_of_match);
061c97d13f1a69 drivers/fpga/xilinx-spi.c Anatolij Gustschin 2017-03-23  264  

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