drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const void *'

[kernel test robot]

Hi Nancy.Lin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1c7873e3364570ec89343ff4877e0f27a7b21a61
commit: 453c3364632a1f305db7d425dc9f8d6711cd3491 drm/mediatek: Add ovl_adaptor support for MT8195
date:   4 months ago
config: arm64-randconfig-r021-20230709 (https://download.01.org/0day-ci/archive/20230710/202307100103.5TXiJnCm-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230710/202307100103.5TXiJnCm-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307100103.5TXiJnCm-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
     415 |                 type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
         |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +415 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c

   391	
   392	static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match)
   393	{
   394		struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
   395		struct device_node *node, *parent;
   396		struct platform_device *comp_pdev;
   397	
   398		parent = dev->parent->parent->of_node->parent;
   399	
   400		for_each_child_of_node(parent, node) {
   401			const struct of_device_id *of_id;
   402			enum mtk_ovl_adaptor_comp_type type;
   403			int id;
   404	
   405			of_id = of_match_node(mtk_ovl_adaptor_comp_dt_ids, node);
   406			if (!of_id)
   407				continue;
   408	
   409			if (!of_device_is_available(node)) {
   410				dev_dbg(dev, "Skipping disabled component %pOF\n",
   411					node);
   412				continue;
   413			}
   414	
 > 415			type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
   416			id = ovl_adaptor_comp_get_id(dev, node, type);
   417			if (id < 0) {
   418				dev_warn(dev, "Skipping unknown component %pOF\n",
   419					 node);
   420				continue;
   421			}
   422	
   423			comp_pdev = of_find_device_by_node(node);
   424			if (!comp_pdev)
   425				return -EPROBE_DEFER;
   426	
   427			priv->ovl_adaptor_comp[id] = &comp_pdev->dev;
   428	
   429			drm_of_component_match_add(dev, match, compare_of, node);
   430			dev_dbg(dev, "Adding component match for %pOF\n", node);
   431		}
   432	
   433		if (!*match) {
   434			dev_err(dev, "No match device for ovl_adaptor\n");
   435			return -ENODEV;
   436		}
   437	
   438		return 0;
   439	}
   440	

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