Hi Chris,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20221215]
[also build test ERROR on linus/master v6.1]
[cannot apply to drm-misc/drm-misc-next drm/drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip drm-exynos/exynos-drm-next v6.1 v6.1-rc8 v6.1-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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chris-Morgan/drm-panel-Add-Magnachip-D53E6EA8966-Panel-Controller/20221216-025402
patch link:    https://lore.kernel.org/r/20221215185211.1560736-2-macroalpha82%40gmail.com
patch subject: [PATCH V6 1/4] drm: of: Add drm_of_get_dsi_bus helper function
config: hexagon-randconfig-r041-20221215
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 98b13979fb05f3ed288a900deb843e7b27589e58)
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/intel-lab-lkp/linux/commit/344107cc66e8043fc936e9bc818c38edbe225f6b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Chris-Morgan/drm-panel-Add-Magnachip-D53E6EA8966-Panel-Controller/20221216-025402
        git checkout 344107cc66e8043fc936e9bc818c38edbe225f6b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/gpu/drm/etnaviv/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/etnaviv/etnaviv_drv.c:7:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/gpu/drm/etnaviv/etnaviv_drv.c:7:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/gpu/drm/etnaviv/etnaviv_drv.c:7:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   In file included from drivers/gpu/drm/etnaviv/etnaviv_drv.c:16:
>> include/drm/drm_of.h:138:1: error: expected identifier or '('
   {
   ^
   6 warnings and 1 error generated.


vim +138 include/drm/drm_of.h

   126	
   127	static inline int
   128	drm_of_get_data_lanes_count_ep(const struct device_node *port,
   129				       int port_reg, int reg,
   130				       const unsigned int min,
   131				       const unsigned int max)
   132	{
   133		return -EINVAL;
   134	}
   135	static int drm_of_get_dsi_bus(struct device *dev,
   136				      struct mipi_dsi_host **dsi_host,
   137				      struct mipi_dsi_device_info *info);
 > 138	{
   139		return -EINVAL;
   140	}
   141	#endif
   142	

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