1 files changed, 89 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
new file mode 100644
index 000000000..f50420099
--- /dev/null
+++ b/Documentation/devicetree/bindings/Makefile
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: GPL-2.0
+DT_DOC_CHECKER ?= dt-doc-validate
+DT_EXTRACT_EX ?= dt-extract-example
+DT_MK_SCHEMA ?= dt-mk-schema
+
+DT_SCHEMA_LINT = $(shell which yamllint)
+
+DT_SCHEMA_MIN_VERSION = 2020.8.1
+
+PHONY += check_dtschema_version
+check_dtschema_version:
+	@{ echo $(DT_SCHEMA_MIN_VERSION); \
+	$(DT_DOC_CHECKER) --version 2>/dev/null || echo 0; } | sort -VC || \
+	{ echo "ERROR: dtschema minimum version is v$(DT_SCHEMA_MIN_VERSION)" >&2; false; }
+
+quiet_cmd_extract_ex = DTEX    $@
+      cmd_extract_ex = $(DT_EXTRACT_EX) $< > $@
+
+$(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE
+	$(call if_changed,extract_ex)
+
+# Use full schemas when checking %.example.dts
+DT_TMP_SCHEMA := $(obj)/processed-schema-examples.json
+
+find_cmd = find $(srctree)/$(src) \( -name '*.yaml' ! \
+		-name 'processed-schema*' ! \
+		-name '*.example.dt.yaml' \)
+
+quiet_cmd_yamllint = LINT    $(src)
+      cmd_yamllint = $(find_cmd) | \
+                     xargs $(DT_SCHEMA_LINT) -f parsable -c $(srctree)/$(src)/.yamllint
+
+quiet_cmd_chk_bindings = CHKDT   $@
+      cmd_chk_bindings = $(find_cmd) | \
+                         xargs -n200 -P$$(nproc) $(DT_DOC_CHECKER) -u $(srctree)/$(src)
+
+quiet_cmd_mk_schema = SCHEMA  $@
+      cmd_mk_schema = f=$$(mktemp) ; \
+                      $(if $(DT_MK_SCHEMA_FLAGS), \
+                           echo $(real-prereqs), \
+                           $(find_cmd)) > $$f ; \
+                      $(DT_MK_SCHEMA) -j $(DT_MK_SCHEMA_FLAGS) @$$f > $@ ; \
+		      rm -f $$f
+
+define rule_chkdt
+	$(if $(DT_SCHEMA_LINT),$(call cmd,yamllint),)
+	$(call cmd,chk_bindings)
+	$(call cmd,mk_schema)
+endef
+
+DT_DOCS = $(shell $(find_cmd) | sed -e 's|^$(srctree)/||')
+
+override DTC_FLAGS := \
+	-Wno-avoid_unnecessary_addr_size \
+	-Wno-graph_child_address \
+	-Wno-interrupt_provider
+
+$(obj)/processed-schema-examples.json: $(DT_DOCS) $(src)/.yamllint check_dtschema_version FORCE
+	$(call if_changed_rule,chkdt)
+
+ifeq ($(DT_SCHEMA_FILES),)
+
+# Unless DT_SCHEMA_FILES is specified, use the full schema for dtbs_check too.
+# Just copy processed-schema-examples.json
+
+$(obj)/processed-schema.json: $(obj)/processed-schema-examples.json FORCE
+	$(call if_changed,copy)
+
+DT_SCHEMA_FILES = $(DT_DOCS)
+
+else
+
+# If DT_SCHEMA_FILES is specified, use it for processed-schema.json
+
+$(obj)/processed-schema.json: DT_MK_SCHEMA_FLAGS := -u
+$(obj)/processed-schema.json: $(DT_SCHEMA_FILES) check_dtschema_version FORCE
+	$(call if_changed,mk_schema)
+
+endif
+
+extra-$(CHECK_DT_BINDING) += processed-schema-examples.json
+extra-$(CHECK_DTBS) += processed-schema.json
+extra-$(CHECK_DT_BINDING) += $(patsubst $(src)/%.yaml,%.example.dts, $(DT_SCHEMA_FILES))
+extra-$(CHECK_DT_BINDING) += $(patsubst $(src)/%.yaml,%.example.dt.yaml, $(DT_SCHEMA_FILES))
+
+# Hack: avoid 'Argument list too long' error for 'make clean'. Remove most of
+# build artifacts here before they are processed by scripts/Makefile.clean
+clean-files = $(shell find $(obj) \( -name '*.example.dts' -o \
+			-name '*.example.dt.yaml' \) -delete 2>/dev/null)