dtc: update warning settings for new bus and node/property name checks

PD#173147: update dtc to v1.4.4

dtc gained new warnings checking PCI and simple buses, unit address
formatting, and stricter node and property name checking. Disable the
new dtc warnings by default as there are 1000s. As before, warnings are
enabled with W=1 or W=2. The strict node and property name checks are a
bit subjective, so they are only enabled for W=2.

Change-Id: Ic9253cdb1f27f59c73f7c337b96c3e8c5f876b20
Signed-off-by: Rob Herring <robh@kernel.org>

scripts/Makefile.lib

@@ -280,7 +280,17 @@ DTC ?= $(objtree)/scripts/dtc/dtc
 
 # Disable noisy checks by default
 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
-DTC_FLAGS += -Wno-unit_address_vs_reg
+DTC_FLAGS += -Wno-unit_address_vs_reg \
+	-Wno-simple_bus_reg \
+	-Wno-unit_address_format \
+	-Wno-pci_bridge \
+	-Wno-pci_device_bus_num \
+	-Wno-pci_device_reg
+endif
+
+ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
+DTC_FLAGS += -Wnode_name_chars_strict \
+	-Wproperty_name_chars_strict
 endif
 
 # Generate an assembly file to wrap the output of the device tree compiler

scripts/dtc/update-dtc-source.sh

@@ -77,4 +77,5 @@ This adds the following commits from upstream:
 ${dtc_log}
 EOF
 )
+
 git commit -e -v -s -m "${commit_msg}"