Hi "Alice,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on renesas-drivers/renesas-clk]
[also build test WARNING on vkoul-dmaengine/next linuxtv-media/master renesas-drivers/renesas-pinctrl renesas-devel/next linus/master v5.12-rc8 next-20210416]
[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]

url:    https://github.com/0day-ci/linux/commits/Alice-Guo-OSS/support-soc_device_match-to-return-EPROBE_DEFER/20210419-123109
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git renesas-clk
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/5dc133669083c08a14f24be6e24b5aa1840836c7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alice-Guo-OSS/support-soc_device_match-to-return-EPROBE_DEFER/20210419-123109
        git checkout 5dc133669083c08a14f24be6e24b5aa1840836c7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/omapdrm/dss/dpi.c: In function 'dpi_init_regulator':
>> drivers/gpu/drm/omapdrm/dss/dpi.c:686:6: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     686 |  soc = soc_device_match(dpi_soc_devices);
         |      ^


vim +/const +686 drivers/gpu/drm/omapdrm/dss/dpi.c

   676	
   677	static int dpi_init_regulator(struct dpi_data *dpi)
   678	{
   679		struct regulator *vdds_dsi;
   680		struct soc_device_attribute *soc;
   681	
   682		/*
   683		 * The DPI uses the DSI VDDS on OMAP34xx, OMAP35xx, OMAP36xx, AM37xx and
   684		 * DM37xx only.
   685		 */
 > 686		soc = soc_device_match(dpi_soc_devices);
   687		if (!IS_ERR(soc) && !soc)
   688			return 0;
   689	
   690		vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
   691		if (IS_ERR(vdds_dsi)) {
   692			if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
   693				DSSERR("can't get VDDS_DSI regulator\n");
   694			return PTR_ERR(vdds_dsi);
   695		}
   696	
   697		dpi->vdds_dsi_reg = vdds_dsi;
   698	
   699		return 0;
   700	}
   701	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org