dt-bindings: Add a minimum version check for dtschema

The dtschema package must be somewhat up to date as the tools and meta-schema checks are still evolving. Implement a version check, so this can be enforced. This will help ensure new schema submissions get checked against the latest meta-schemas.

Cc Masahiro Yamada <[email protected]>

Signed-off-by Rob Herring <[email protected]>

---
v3:
- Drop leading '0' in version month
- Rework with Masahiro's shell commands

v2:
- Use a build rule for the version check instead

---
 Documentation/devicetree/bindings/Makefile | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Documentation/devicetree/bindings/Makefile +11 -4

index 1df680d07461..67b0969281da 100644
@@ -3,11 +3,19 @@ DT_DOC_CHECKER ?= dt-doc-validate
 DT_EXTRACT_EX ?= dt-extract-example
 DT_MK_SCHEMA ?= dt-mk-schema
 
+DT_SCHEMA_MIN_VERSION = 2020.4
+
+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_chk_binding = CHKDT   $(patsubst $(srctree)/%,%,$<)
       cmd_chk_binding = $(DT_DOC_CHECKER) -u $(srctree)/$(src) $< ; \
                         $(DT_EXTRACT_EX) $< > $@
 
-$(obj)/%.example.dts: $(src)/%.yaml FORCE
+$(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE
        $(call if_changed,chk_binding)
 
 # Use full schemas when checking %.example.dts

@@ -34,11 +42,11 @@ override DTC_FLAGS := \
        -Wno-avoid_unnecessary_addr_size \
        -Wno-graph_child_address
 
-$(obj)/processed-schema-examples.yaml: $(DT_DOCS) FORCE
+$(obj)/processed-schema-examples.yaml: $(DT_DOCS) check_dtschema_version FORCE
        $(call if_changed,mk_schema)
 
 $(obj)/processed-schema.yaml: DT_MK_SCHEMA_FLAGS := -u
-$(obj)/processed-schema.yaml: $(DT_SCHEMA_FILES) FORCE
+$(obj)/processed-schema.yaml: $(DT_SCHEMA_FILES) check_dtschema_version FORCE
        $(call if_changed,mk_schema)
 
 extra-y += processed-schema.yaml
--

2.20.1