-DTC_FLAGS += $(call dtc-option,-Wno-unit_address_vs_reg)
-DTC_FLAGS += $(call dtc-option,-Wno-simple_bus_reg)
-DTC_FLAGS += $(call dtc-option,-Wno-unit_address_format)
-DTC_FLAGS += $(call dtc-option,-Wno-pci_bridge)
-DTC_FLAGS += $(call dtc-option,-Wno-pci_device_bus_num)
-DTC_FLAGS += $(call dtc-option,-Wno-pci_device_reg)
+DTC_FLAGS += -Wno-unit_address_vs_reg
+DTC_FLAGS += -Wno-simple_bus_reg
+DTC_FLAGS += -Wno-unit_address_format
+DTC_FLAGS += -Wno-pci_bridge
+DTC_FLAGS += -Wno-pci_device_bus_num
+DTC_FLAGS += -Wno-pci_device_reg