• Rob Herring's avatar
    dt-bindings: kbuild: Use DTB files for validation · ef8795f3
    Rob Herring authored
    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: default avatarRob Herring <robh@kernel.org>
    Tested-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
    Link: https://lore.kernel.org/r/20220310160513.1708182-3-robh@kernel.org
    ef8795f3
Makefile 1.14 KB