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: arm64-defconfig (attached as .config)
compiler: clang version 11.0.0 (git://gitmirror/llvm_project a0cd413426479abb207381bdbab862f3dfb3ce7d)
reproduce:
        # FIXME the reproduce steps for clang is not ready yet

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_dsi.c:1705:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
           ^
   drivers/gpu/drm/exynos/exynos_drm_dsi.c:1705:2: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.
--
>> drivers/gpu/drm/exynos/exynos_hdmi.c:1851:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
           ^
   drivers/gpu/drm/exynos/exynos_hdmi.c:1851:2: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.

vim +/drm_simple_encoder_init +1705 drivers/gpu/drm/exynos/exynos_drm_dsi.c

  1695	
  1696	static int exynos_dsi_bind(struct device *dev, struct device *master,
  1697					void *data)
  1698	{
  1699		struct drm_encoder *encoder = dev_get_drvdata(dev);
  1700		struct exynos_dsi *dsi = encoder_to_dsi(encoder);
  1701		struct drm_device *drm_dev = data;
  1702		struct drm_bridge *in_bridge;
  1703		int ret;
  1704	
> 1705		drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
  1706	
  1707		drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
  1708	
  1709		ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
  1710		if (ret < 0)
  1711			return ret;
  1712	
  1713		if (dsi->in_bridge_node) {
  1714			in_bridge = of_drm_find_bridge(dsi->in_bridge_node);
  1715			if (in_bridge)
  1716				drm_bridge_attach(encoder, in_bridge, NULL, 0);
  1717		}
  1718	
  1719		return mipi_dsi_host_register(&dsi->dsi_host);
  1720	}
  1721	

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