[PATCH v4 5/9] mfd: mt6397: Add support for MT6392 PMIC

[kernel test robot]

Hi Luca,

kernel test robot noticed the following build warnings:

[auto build test WARNING on lee-mfd/for-mfd-next]
[also build test WARNING on broonie-regulator/for-next linusw-pinctrl/devel linusw-pinctrl/for-next lee-mfd/for-mfd-fixes linus/master v7.0-rc6 next-20260330]
[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/Luca-Leonardo-Scorcia/dt-bindings-mfd-mt6397-Add-MT6392-PMIC/20260331-081127
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
patch link:    https://lore.kernel.org/r/20260330083429.359819-6-l.scorcia%40gmail.com
patch subject: [PATCH v4 5/9] mfd: mt6397: Add support for MT6392 PMIC
config: s390-randconfig-002-20260331 (https://download.01.org/0day-ci/archive/20260331/202603312339.CMJpqhEq-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260331/202603312339.CMJpqhEq-lkp@intel.com/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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603312339.CMJpqhEq-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/mfd/mt6397-core.c:421:16: warning: cast to smaller integer type 'enum mfd_match_data' from 'const void *' [-Wvoid-pointer-to-enum-cast]
     421 |         device_data = (enum mfd_match_data)of_device_get_match_data(&pdev->dev);
         |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +421 drivers/mfd/mt6397-core.c

   398	
   399	static int mt6397_probe(struct platform_device *pdev)
   400	{
   401		int ret;
   402		unsigned int id = 0;
   403		struct mt6397_chip *pmic;
   404		const struct chip_data *pmic_core;
   405		enum mfd_match_data device_data;
   406	
   407		pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
   408		if (!pmic)
   409			return -ENOMEM;
   410	
   411		pmic->dev = &pdev->dev;
   412	
   413		/*
   414		 * mt6397 MFD is child device of soc pmic wrapper.
   415		 * Regmap is set from its parent.
   416		 */
   417		pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL);
   418		if (!pmic->regmap)
   419			return -ENODEV;
   420	
 > 421		device_data = (enum mfd_match_data)of_device_get_match_data(&pdev->dev);
   422		switch (device_data) {
   423		case MATCH_DATA_MT6323:
   424			pmic_core = &mt6323_core;
   425			break;
   426		case MATCH_DATA_MT6328:
   427			pmic_core = &mt6328_core;
   428			break;
   429		case MATCH_DATA_MT6331:
   430			pmic_core = &mt6331_mt6332_core;
   431			break;
   432		case MATCH_DATA_MT6357:
   433			pmic_core = &mt6357_core;
   434			break;
   435		case MATCH_DATA_MT6358:
   436			pmic_core = &mt6358_core;
   437			break;
   438		case MATCH_DATA_MT6359:
   439			pmic_core = &mt6359_core;
   440			break;
   441		case MATCH_DATA_MT6392:
   442			pmic_core = &mt6392_core;
   443			break;
   444		case MATCH_DATA_MT6397:
   445			pmic_core = &mt6397_core;
   446			break;
   447		default:
   448			dev_err(&pdev->dev, "Unknown device match data %u\n", device_data);
   449			return -ENODEV;
   450		}
   451	
   452		ret = regmap_read(pmic->regmap, pmic_core->cid_addr, &id);
   453		if (ret) {
   454			dev_err(&pdev->dev, "Failed to read chip id: %d\n", ret);
   455			return ret;
   456		}
   457	
   458		pmic->chip_id = (id >> pmic_core->cid_shift) & 0xff;
   459	
   460		platform_set_drvdata(pdev, pmic);
   461	
   462		pmic->irq = platform_get_irq(pdev, 0);
   463		if (pmic->irq <= 0)
   464			return pmic->irq;
   465	
   466		ret = pmic_core->irq_init(pmic);
   467		if (ret)
   468			return ret;
   469	
   470		ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
   471					   pmic_core->cells, pmic_core->cell_size,
   472					   NULL, 0, pmic->irq_domain);
   473		if (ret) {
   474			irq_domain_remove(pmic->irq_domain);
   475			dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
   476		}
   477	
   478		return ret;
   479	}
   480	

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