Hi Qin,

I love your patch! Perhaps something to improve:

[auto build test WARNING on pza/reset/next]
[also build test WARNING on robh/for-next clk/clk-next linus/master v5.15]
[cannot apply to tip/irq/core next-20211029]
[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/Qin-Jian/dt-bindings-vendor-prefixes-Add-Sunplus/20211101-140155
base:   https://git.pengutronix.de/git/pza/linux reset/next
config: arc-randconfig-r016-20211101 (attached as .config)
compiler: arceb-elf-gcc (GCC) 11.2.0
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/ca53c40693bc90c44e3ec4c95c7758d7342229e2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Qin-Jian/dt-bindings-vendor-prefixes-Add-Sunplus/20211101-140155
        git checkout ca53c40693bc90c44e3ec4c95c7758d7342229e2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 

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/irqchip/irq-sp7021-intc.c:217:6: warning: no previous prototype for 'sp_intc_set_ext' [-Wmissing-prototypes]
     217 | void sp_intc_set_ext(u32 hwirq, int ext_num)
         |      ^~~~~~~~~~~~~~~
>> drivers/irqchip/irq-sp7021-intc.c:223:12: warning: no previous prototype for 'sp_intc_init_dt' [-Wmissing-prototypes]
     223 | int __init sp_intc_init_dt(struct device_node *node, struct device_node *parent)
         |            ^~~~~~~~~~~~~~~


vim +/sp_intc_set_ext +217 drivers/irqchip/irq-sp7021-intc.c

   216	
 > 217	void sp_intc_set_ext(u32 hwirq, int ext_num)
   218	{
   219		sp_intc_assign_bit(hwirq, REG_INTR_PRIORITY, !ext_num);
   220	}
   221	EXPORT_SYMBOL_GPL(sp_intc_set_ext);
   222	
 > 223	int __init sp_intc_init_dt(struct device_node *node, struct device_node *parent)

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