Hi Robert, FYI, the error/warning still remains. tree: https://github.com/Freescale/linux-fslc pr/288 head: 26c3698b94fe22823c8dcefb548326265c708b5c commit: c40c90f2d3265167edd6384dd8691dc88f78308d [10205/17591] LF-811-1: drm/bridge: Add driver for legacy Freescale Seiko 43WVFIG adapter config: mips-randconfig-r006-20210312 (attached as .config) compiler: mips-linux-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/Freescale/linux-fslc/commit/c40c90f2d3265167edd6384dd8... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc pr/288 git checkout c40c90f2d3265167edd6384dd8691dc88f78308d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c: In function 'seiko_adapter_probe': 214 | adap->bridge.of_node = dev->of_node; | ^ In file included from drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c:20: At top level: include/drm/drm_of.h:64:12: warning: 'drm_of_component_probe_with_match' defined but not used [-Wunused-function] 64 | static int drm_of_component_probe_with_match(struct device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for DRM_SEC_MIPI_DSIM Depends on HAS_IOMEM && DRM && DRM_BRIDGE && OF Selected by - DRM_IMX_SEC_DSIM && HAS_IOMEM && DRM_IMX WARNING: unmet direct dependencies detected for DRM_CDNS_MHDP Depends on HAS_IOMEM && DRM && DRM_BRIDGE && OF Selected by - DRM_IMX_CDNS_MHDP && HAS_IOMEM && DRM_IMX WARNING: unmet direct dependencies detected for GPIO_MXC Depends on GPIOLIB && HAS_IOMEM && ARCH_MXC Selected by - GPIO_MXC_PAD_WAKEUP && GPIOLIB && HAS_IOMEM && IMX_SCU WARNING: unmet direct dependencies detected for INPUT_POLLDEV Depends on !UML && INPUT Selected by - MXC_MMA8451 && HWMON && I2C vim +214 drivers/gpu/drm/bridge/nxp-seiko-43wvfig.c 166 167 static int seiko_adapter_probe(struct platform_device *pdev) 168 { 169 struct device *dev = &pdev->dev; 170 struct seiko_adapter *adap; 171 struct device_node *remote; 172 u32 bus_mode; 173 int port; 174 175 adap = devm_kzalloc(dev, sizeof(*adap), GFP_KERNEL); 176 if (!adap) 177 return -ENOMEM; 178 179 of_property_read_u32(dev->of_node, "bus_mode", &bus_mode); 180 if (bus_mode != 18 && bus_mode != 24) { 181 dev_err(dev, "Invalid bus_mode: %d\n", bus_mode); 182 return -EINVAL; 183 } 184 185 switch (bus_mode) { 186 case 18: 187 adap->bpc = 6; 188 adap->bus_format = MEDIA_BUS_FMT_RGB666_1X18; 189 break; 190 case 24: 191 adap->bpc = 8; 192 adap->bus_format = MEDIA_BUS_FMT_RGB888_1X24; 193 break; 194 } 195 196 for (port = 0; port < 2; port++) { 197 remote = of_graph_get_remote_node(dev->of_node, port, -1); 198 if (!remote) { 199 dev_err(dev, "No remote for port %d\n", port); 200 return -ENODEV; 201 } 202 adap->panel = of_drm_find_panel(remote); 203 if (!IS_ERR(adap->panel)) 204 break; 205 } 206 if (IS_ERR(adap->panel)) { 207 dev_err(dev, "No panel found: %ld\n", PTR_ERR(adap->panel)); 208 return PTR_ERR(adap->panel); 209 } 210 211 adap->dev = dev; 212 adap->bridge.driver_private = adap; 213 adap->bridge.funcs = &seiko_adapter_bridge_funcs; 215 216 drm_bridge_add(&adap->bridge); 217 218 return 0; 219 } 220 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org