Hi WANG,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on next-20210505]
[cannot apply to abelloni/rtc-next robh/for-next v5.12]
[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/WANG-Xuerui/rtc-ls2x-Add-support-for-the-Loongson-2K-LS7A-RTC/20210506-013703
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d665ea6ea86c785760ee4bad4543dab3267ad074
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-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/a4a12242f17c2ad92025b724458a31eb088e1893
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review WANG-Xuerui/rtc-ls2x-Add-support-for-the-Loongson-2K-LS7A-RTC/20210506-013703
        git checkout a4a12242f17c2ad92025b724458a31eb088e1893
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):

   drivers/rtc/rtc-ls2x.c: In function 'ls2x_rtc_probe':

quoted

drivers/rtc/rtc-ls2x.c:202:9: error: implicit declaration of function 'rtc_register_device'; did you mean 'devm_rtc_register_device'? [-Werror=implicit-function-declaration]

     202 |  return rtc_register_device(rtc);
         |         ^~~~~~~~~~~~~~~~~~~
         |         devm_rtc_register_device
   drivers/rtc/rtc-ls2x.c: At top level:

quoted

drivers/rtc/rtc-ls2x.c:205:34: error: array type has incomplete element type 'struct of_device_id'

     205 | static const struct of_device_id ls2x_rtc_of_match[] = {
         |                                  ^~~~~~~~~~~~~~~~~

quoted

drivers/rtc/rtc-ls2x.c:206:4: error: field name not in record or union initializer

     206 |  { .compatible = "loongson,ls2x-rtc" },
         |    ^
   drivers/rtc/rtc-ls2x.c:206:4: note: (near initialization for 'ls2x_rtc_of_match')

quoted

drivers/rtc/rtc-ls2x.c:215:21: error: implicit declaration of function 'of_match_ptr' [-Werror=implicit-function-declaration]

     215 |   .of_match_table = of_match_ptr(ls2x_rtc_of_match),
         |                     ^~~~~~~~~~~~
   drivers/rtc/rtc-ls2x.c:205:34: warning: 'ls2x_rtc_of_match' defined but not used [-Wunused-variable]
     205 | static const struct of_device_id ls2x_rtc_of_match[] = {
         |                                  ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +202 drivers/rtc/rtc-ls2x.c

   152	
   153	static int ls2x_rtc_probe(struct platform_device *pdev)
   154	{
   155		struct device *dev = &pdev->dev;
   156		struct rtc_device *rtc;
   157		struct ls2x_rtc_priv *priv;
   158		void __iomem *regs;
   159		int ret;
   160	
   161		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
   162		if (unlikely(!priv))
   163			return -ENOMEM;
   164	
   165		spin_lock_init(&priv->lock);
   166		platform_set_drvdata(pdev, priv);
   167	
   168		regs = devm_platform_ioremap_resource(pdev, 0);
   169		if (IS_ERR(regs)) {
   170			ret = PTR_ERR(regs);
   171			dev_err(dev, "Failed to map rtc registers: %d\n", ret);
   172			return ret;
   173		}
   174	
   175		priv->regmap = devm_regmap_init_mmio(dev, regs,
   176						     &ls2x_rtc_regmap_config);
   177		if (IS_ERR(priv->regmap)) {
   178			ret = PTR_ERR(priv->regmap);
   179			dev_err(dev, "Failed to init regmap: %d\n", ret);
   180			return ret;
   181		}
   182	
   183		rtc = devm_rtc_allocate_device(dev);
   184		if (IS_ERR(rtc)) {
   185			ret = PTR_ERR(rtc);
   186			dev_err(dev, "Failed to allocate rtc device: %d\n", ret);
   187			return ret;
   188		}
   189	
   190		rtc->ops = &ls2x_rtc_ops;
   191	
   192		/* Due to hardware erratum, all years multiple of 4 are considered
   193		 * leap year, so only years 2000 through 2099 are usable.
   194		 *
   195		 * Previous out-of-tree versions of this driver wrote tm_year directly
   196		 * into the year register, so epoch 2000 must be used to preserve
   197		 * semantics on shipped systems.
   198		 */
   199		rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
   200		rtc->range_max = RTC_TIMESTAMP_END_2099;
   201	
 > 202		return rtc_register_device(rtc);
   203	}
   204	
 > 205	static const struct of_device_id ls2x_rtc_of_match[] = {
 > 206		{ .compatible = "loongson,ls2x-rtc" },
   207		{ /* sentinel */ },
   208	};
   209	MODULE_DEVICE_TABLE(of, ls2x_rtc_of_match);
   210	
   211	static struct platform_driver ls2x_rtc_driver = {
   212		.probe		= ls2x_rtc_probe,
   213		.driver		= {
   214			.name	= "ls2x-rtc",
 > 215			.of_match_table = of_match_ptr(ls2x_rtc_of_match),
   216		},
   217	};
   218	

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