These warnings are sort of annoying. I guess most of the other
drivers avoid this by depending on OF as well as COMPILE_TEST.
$ grep -E "CONFIG_(OF|PCIE_(SPEAR13XX|ARMADA_8K))" .config
CONFIG_PCIE_SPEAR13XX=y
CONFIG_PCIE_ARMADA_8K=y
# CONFIG_OF is not set
$ make W=1 drivers/pci/
...
CC drivers/pci/controller/dwc/pcie-spear13xx.o
drivers/pci/controller/dwc/pcie-spear13xx.c:270:34: warning: ‘spear13xx_pcie_of_match’ defined but not used [-Wunused-const-variable=]
270 | static const struct of_device_id spear13xx_pcie_of_match[] = {
| ^~~~~~~~~~~~~~~~~~~~~~~
...
CC drivers/pci/controller/dwc/pcie-armada8k.o
drivers/pci/controller/dwc/pcie-armada8k.c:344:34: warning: ‘armada8k_pcie_of_match’ defined but not used [-Wunused-const-variable=]
344 | static const struct of_device_id armada8k_pcie_of_match[] = {
| ^~~~~~~~~~~~~~~~~~~~~~
