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dt-bindings: kbuild: Use DTB files for validation
Switch the DT validation to use DTB files directly instead of a DTS to YAML conversion. The original motivation for supporting validation on DTB files was to enable running validation on a running system (e.g. 'dt-validate /sys/firmware/fdt') or other cases where the original source DTS is not available. The YAML format was not without issues. Using DTBs with the schema type information solves some of those problems. The YAML format relies on the DTS source level information including bracketing of properties, size directives, and phandle tags all of which are lost in a DTB file. While standardizing the bracketing is a good thing, it does cause a lot of extra warnings and churn to fix them. Another issue has been signed types are not validated correctly as sign information is not propagated to YAML. Using the schema type information allows for proper handling of signed types. YAML also can't represent the full range of 64-bit integers as numbers are stored as floats by most/all parsers. The DTB validation works by decoding property values using the type information in the schemas themselves. The main corner case this does not work for is matrix types where neither dimension is fixed. For now, checking the dimensions in these cases are skipped. Signed-off-by: Rob Herring <robh@kernel.org> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20220310160513.1708182-3-robh@kernel.org
This commit is contained in:
Rob Herring
parent
2783a7f56f
commit
ef8795f3f1
@ -26,8 +26,7 @@ $(obj)/%.example.dts: $(src)/%.yaml check_dtschema_version FORCE
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$(call if_changed,extract_ex)
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find_all_cmd = find $(srctree)/$(src) \( -name '*.yaml' ! \
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-name 'processed-schema*' ! \
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-name '*.example.dt.yaml' \)
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-name 'processed-schema*' \)
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find_cmd = $(find_all_cmd) | grep -F "$(DT_SCHEMA_FILES)"
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CHK_DT_DOCS := $(shell $(find_cmd))
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@ -72,9 +71,9 @@ $(obj)/processed-schema.json: $(DT_DOCS) $(src)/.yamllint check_dtschema_version
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always-y += processed-schema.json
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always-$(CHECK_DT_BINDING) += $(patsubst $(srctree)/$(src)/%.yaml,%.example.dts, $(CHK_DT_DOCS))
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always-$(CHECK_DT_BINDING) += $(patsubst $(srctree)/$(src)/%.yaml,%.example.dt.yaml, $(CHK_DT_DOCS))
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always-$(CHECK_DT_BINDING) += $(patsubst $(srctree)/$(src)/%.yaml,%.example.dtb, $(CHK_DT_DOCS))
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# Hack: avoid 'Argument list too long' error for 'make clean'. Remove most of
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# build artifacts here before they are processed by scripts/Makefile.clean
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clean-files = $(shell find $(obj) \( -name '*.example.dts' -o \
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-name '*.example.dt.yaml' \) -delete 2>/dev/null)
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-name '*.example.dtb' \) -delete 2>/dev/null)
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@ -120,21 +120,14 @@ project can be installed with pip::
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pip3 install dtschema
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Note that 'dtschema' installation requires 'swig' and Python development files
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installed first. On Debian/Ubuntu systems::
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apt install swig python3-dev
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Several executables (dt-doc-validate, dt-mk-schema, dt-validate) will be
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installed. Ensure they are in your PATH (~/.local/bin by default).
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dtc must also be built with YAML output support enabled. This requires that
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libyaml and its headers be installed on the host system. For some distributions
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that involves installing the development package, such as:
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Debian::
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apt-get install libyaml-dev
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Fedora::
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dnf -y install libyaml-devel
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Running checks
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~~~~~~~~~~~~~~
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@ -87,11 +87,6 @@ base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m,
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always-y += $(dtb-y)
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ifneq ($(CHECK_DTBS),)
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always-y += $(patsubst %.dtb,%.dt.yaml, $(real-dtb-y))
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always-y += $(patsubst %.dtbo,%.dt.yaml, $(real-dtb-y))
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endif
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# Add subdir path
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extra-y := $(addprefix $(obj)/,$(extra-y))
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@ -347,12 +342,6 @@ cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ;
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-d $(depfile).dtc.tmp $(dtc-tmp) ; \
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cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
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$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
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$(call if_changed_dep,dtc)
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$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
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$(call if_changed_dep,dtc)
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quiet_cmd_fdtoverlay = DTOVL $@
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cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs)
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@ -360,22 +349,27 @@ $(multi-dtb-y): FORCE
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$(call if_changed,fdtoverlay)
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$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
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ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),)
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DT_CHECKER ?= dt-validate
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DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
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DT_BINDING_DIR := Documentation/devicetree/bindings
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DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
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quiet_cmd_dtb_check = CHECK $@
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cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
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cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
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endif
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define rule_dtc
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$(call cmd_and_fixdep,dtc)
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$(call cmd,dtb_check)
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endef
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$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
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$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
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$(call if_changed_rule,dtc)
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$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
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$(call if_changed_dep,dtc)
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dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
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# Bzip2
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@ -17,20 +17,7 @@ fdtoverlay-objs := $(libfdt) fdtoverlay.o util.o
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# Source files need to get at the userspace version of libfdt_env.h to compile
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HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
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ifeq ($(shell pkg-config --exists yaml-0.1 2>/dev/null && echo yes),)
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ifneq ($(CHECK_DT_BINDING)$(CHECK_DTBS),)
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$(error dtc needs libyaml for DT schema validation support. \
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Install the necessary libyaml development package.)
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endif
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HOST_EXTRACFLAGS += -DNO_YAML
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else
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dtc-objs += yamltree.o
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# To include <yaml.h> installed in a non-default path
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HOSTCFLAGS_yamltree.o := $(shell pkg-config --cflags yaml-0.1)
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# To link libyaml installed in a non-default path
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HOSTLDLIBS_dtc := $(shell pkg-config --libs yaml-0.1)
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endif
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# Generated files need one more search path to include headers in source tree
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HOSTCFLAGS_dtc-lexer.lex.o := -I $(srctree)/$(src)
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@ -32,7 +32,7 @@ DTC_UPSTREAM_PATH=`pwd`/../dtc
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DTC_LINUX_PATH=`pwd`/scripts/dtc
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DTC_SOURCE="checks.c data.c dtc.c dtc.h flattree.c fstree.c livetree.c srcpos.c \
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srcpos.h treesource.c util.c util.h version_gen.h yamltree.c \
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srcpos.h treesource.c util.c util.h version_gen.h \
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dtc-lexer.l dtc-parser.y"
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LIBFDT_SOURCE="fdt.c fdt.h fdt_addresses.c fdt_empty_tree.c \
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fdt_overlay.c fdt_ro.c fdt_rw.c fdt_strerror.c fdt_sw.c \
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