Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200305]
[also build test ERROR on v5.6-rc4]
[cannot apply to rockchip/for-next shawnguo/for-next sunxi/sunxi/for-next tegra/for-next linus/master v5.6-rc4 v5.6-rc3 v5.6-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Thomas-Zimmermann/drm-Convert-drivers-to-drm_simple_encoder_init/20200306-045931
base:    47466dcf84ee66a973ea7d2fca7e582fe9328932
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

All errors (new ones prefixed by >>):

   drivers/gpu/drm/exynos/exynos_drm_dpi.c: In function 'exynos_dpi_bind':
>> drivers/gpu/drm/exynos/exynos_drm_dpi.c:201:2: error: implicit declaration of function 'drm_simple_encoder_init'; did you mean 'drm_encoder_init'? [-Werror=implicit-function-declaration]
     drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
     ^~~~~~~~~~~~~~~~~~~~~~~
     drm_encoder_init
   cc1: some warnings being treated as errors
--
   drivers/gpu/drm/exynos/exynos_dp.c: In function 'exynos_dp_bind':
>> drivers/gpu/drm/exynos/exynos_dp.c:174:2: error: implicit declaration of function 'drm_simple_encoder_init'; did you mean 'drm_encoder_init'? [-Werror=implicit-function-declaration]
     drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
     ^~~~~~~~~~~~~~~~~~~~~~~
     drm_encoder_init
   cc1: some warnings being treated as errors

vim +201 drivers/gpu/drm/exynos/exynos_drm_dpi.c

   196	
   197	int exynos_dpi_bind(struct drm_device *dev, struct drm_encoder *encoder)
   198	{
   199		int ret;
   200	
 > 201		drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
   202	
   203		drm_encoder_helper_add(encoder, &exynos_dpi_encoder_helper_funcs);
   204	
   205		ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
   206		if (ret < 0)
   207			return ret;
   208	
   209		ret = exynos_dpi_create_connector(encoder);
   210		if (ret) {
   211			DRM_DEV_ERROR(encoder_to_dpi(encoder)->dev,
   212				      "failed to create connector ret = %d\n", ret);
   213			drm_encoder_cleanup(encoder);
   214			return ret;
   215		}
   216	
   217		return 0;
   218	}
   219	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org