Hi Chris,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rockchip/for-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.2-rc3 next-20230110]
[cannot apply to drm-misc/drm-misc-next]
[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-of-Add-drm_of_get_dsi_bus-helper-function/20230111-040413
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git for-next
patch link:    https://lore.kernel.org/r/20230110200255.1218738-2-macroalpha82%40gmail.com
patch subject: [PATCH v8 1/4] drm: of: Add drm_of_get_dsi_bus helper function
config: x86_64-rhel-8.3-kselftests
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/d2ebfa16b561f07b4ad2afd2c1ce75395150c01e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Chris-Morgan/drm-of-Add-drm_of_get_dsi_bus-helper-function/20230111-040413
        git checkout d2ebfa16b561f07b4ad2afd2c1ce75395150c01e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_bridge.c:32:
>> include/drm/drm_of.h:134:23: warning: no previous prototype for 'drm_of_get_dsi_bus' [-Wmissing-prototypes]
     134 | struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev,
         |                       ^~~~~~~~~~~~~~~~~~


vim +/drm_of_get_dsi_bus +134 include/drm/drm_of.h

   125	
   126	static inline int
   127	drm_of_get_data_lanes_count_ep(const struct device_node *port,
   128				       int port_reg, int reg,
   129				       const unsigned int min,
   130				       const unsigned int max)
   131	{
   132		return -EINVAL;
   133	}
 > 134	struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev,
   135						 struct mipi_dsi_device_info *info)
   136	{
   137		return ERR_PTR(-EINVAL);
   138	}
   139	#endif
   140	

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