drivers/mfd/ls2k-bmc-core.c:108:14: sparse: sparse: incorrect type in assignment (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   11439c4635edd669ae435eec308f4ab8a0804808
commit: 0d64f6d1ffe96f59145481f7413344b1fa3ad1ce mfd: ls2kbmc: Introduce Loongson-2K BMC core driver
date:   5 months ago
config: loongarch-randconfig-r112-20260302 (https://download.01.org/0day-ci/archive/20260302/202603021730.Yy3QXYTw-lkp@xxxxxxxxx/config)
compiler: loongarch64-linux-gcc (GCC) 15.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260302/202603021730.Yy3QXYTw-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/202603021730.Yy3QXYTw-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> drivers/mfd/ls2k-bmc-core.c:108:14: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected char *mode @@     got void [noderef] __iomem * @@
   drivers/mfd/ls2k-bmc-core.c:108:14: sparse:     expected char *mode
   drivers/mfd/ls2k-bmc-core.c:108:14: sparse:     got void [noderef] __iomem *

vim +108 drivers/mfd/ls2k-bmc-core.c

    97	
    98	/*
    99	 * Currently the Loongson-2K BMC hardware does not have an I2C interface to adapt to the
   100	 * resolution. We set the resolution by presetting "video=1280x1024-16@2M" to the BMC memory.
   101	 */
   102	static int ls2k_bmc_parse_mode(struct pci_dev *pdev, struct simplefb_platform_data *pd)
   103	{
   104		char *mode;
   105		int depth, ret;
   106	
   107		/* The last 16M of PCI BAR0 is used to store the resolution string. */
 > 108		mode = devm_ioremap(&pdev->dev, pci_resource_start(pdev, 0) + SZ_16M, SZ_16M);
   109		if (!mode)
   110			return -ENOMEM;
   111	
   112		/* The resolution field starts with the flag "video=". */
   113		if (!strncmp(mode, "video=", 6))
   114			mode = mode + 6;
   115	
   116		ret = kstrtoint(strsep(&mode, "x"), 10, &pd->width);
   117		if (ret)
   118			return ret;
   119	
   120		ret = kstrtoint(strsep(&mode, "-"), 10, &pd->height);
   121		if (ret)
   122			return ret;
   123	
   124		ret = kstrtoint(strsep(&mode, "@"), 10, &depth);
   125		if (ret)
   126			return ret;
   127	
   128		pd->stride = pd->width * depth / 8;
   129		pd->format = depth == 32 ? "a8r8g8b8" : "r5g6b5";
   130	
   131		return 0;
   132	}
   133	

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