Hi "周琰杰, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on usb/usb-testing] [also build test WARNING on robh/for-next linus/master v5.8-rc6 next-20200724] [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/Zhou-Yanjie/dt-bindings-USB-Add-bindings-for-new-Ingenic-SoCs/20200725-161930 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: x86_64-randconfig-a005-20200726 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 8bf4c1f4fb257774f66c8cda07adc6c5e8668326) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/phy/ingenic/phy-ingenic-usb.c:312:34: warning: unused variable 'ingenic_usb_phy_of_matches' [-Wunused-const-variable] static const struct of_device_id ingenic_usb_phy_of_matches[] = { ^ 1 warning generated. vim +/ingenic_usb_phy_of_matches +312 drivers/phy/ingenic/phy-ingenic-usb.c 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 311) 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 @312) static const struct of_device_id ingenic_usb_phy_of_matches[] = { 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 313) { .compatible = "ingenic,jz4770-phy", .data = &jz4770_soc_info }, 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 314) { .compatible = "ingenic,jz4780-phy", .data = &jz4780_soc_info }, 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 315) { .compatible = "ingenic,x1000-phy", .data = &x1000_soc_info }, 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 316) { .compatible = "ingenic,x1830-phy", .data = &x1830_soc_info }, 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 317) { /* sentinel */ } 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 318) }; 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 319) MODULE_DEVICE_TABLE(of, ingenic_usb_phy_of_matches); 1b2b8a5d62b618 drivers/usb/phy/phy-jz4770.c 周琰杰 (Zhou Yanjie 2020-07-25 320) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org