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Add a Python tool that checks DTS coding style on examples in YAML
binding files and on .dts/.dtsi/.dtso source files. Rules are kept in
a small declarative registry, each tagged 'relaxed' (default; must be
zero-violation on the current tree) or 'strict' (opt-in for new
submissions). Promoting a rule from strict to relaxed is a one-line
edit once the tree is clean.
Relaxed mode covers trailing whitespace, tab characters in YAML
examples, mixed tab+space indents, and missing tabs in .dts files.
Strict adds indent unit and consistency checks, blank-line placement,
sibling address ordering, "compatible" and "reg" ordering, and unused
labels.
The tool reads file paths from @argfile and parallelises across CPUs
via -j N. With no -j given it picks up $PARALLELISM (set by
scripts/jobserver-exec from the GNU make jobserver) and falls back to
os.cpu_count() otherwise. Running as one Python invocation amortises
the ruamel.yaml import across the whole tree -- ~2s on a 32-CPU host
vs ~28s sequential.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/224923f3d1c73ff55cebb3e0796f119e32c1bb43.1779908995.git.daniel@makrotopia.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
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