Hi Souradeep,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on robh/for-next linus/master v5.15-rc3 next-20210922]
[cannot apply to balbi-usb/testing/next]
[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/Souradeep-Chowdhury/Add-Embedded-USB-Debugger-EUD-driver/20211004-191901
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: arc-allyesconfig (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/4f53df1d9b6786f951384f59e3ffa7fed1817a2d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Souradeep-Chowdhury/Add-Embedded-USB-Debugger-EUD-driver/20211004-191901
        git checkout 4f53df1d9b6786f951384f59e3ffa7fed1817a2d
        # 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 errors (new ones prefixed by >>):

   drivers/usb/dwc3/drd.c: In function 'dwc3_register_eud':
>> drivers/usb/dwc3/drd.c:171:54: error: variable 'con_np' set but not used [-Werror=unused-but-set-variable]
     171 |         struct device_node      *np = dev->of_node, *con_np;
         |                                                      ^~~~~~
   cc1: all warnings being treated as errors


vim +/con_np +171 drivers/usb/dwc3/drd.c

   167	
   168	static int dwc3_register_eud(struct dwc3 *dwc)
   169	{
   170		struct device           *dev = dwc->dev;
 > 171		struct device_node      *np = dev->of_node, *con_np;
   172		int                     ret;
   173	
   174		con_np = of_get_child_by_name(np, "eud_usb_connector");
   175		if (!np) {
   176			dev_dbg(dev, "no usb_connector child node specified\n");
   177			return 0;
   178		}
   179	
   180		ret = of_platform_populate(np, NULL, NULL, dev);
   181		if (ret) {
   182			dev_err(dev, "failed to register usb_connector - %d\n", ret);
   183			return ret;
   184		}
   185	
   186		return 0;
   187	}
   188	

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