How to check (an updated) schema if make dt_binding_check fails already?

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>]

Hi!

I would like to extend an existing schema, the checker currently (on Debian
unstable) fails with the recent in-kernel schema. What should I do?

$ make dt_binding_check DT_SCHEMA_FILES=/usb/snps,dwc3.yaml
  SCHEMA  Documentation/devicetree/bindings/processed-schema.json
  Traceback (most recent call last):
    File "/usr/bin/dt-mk-schema", line 8, in <module>
        sys.exit(main())
                 ^^^^^^
      File "/usr/lib/python3/dist-packages/dtschema/mk_schema.py", line 28, in main
        schemas = dtschema.DTValidator(args.schemas).schemas
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/usr/lib/python3/dist-packages/dtschema/validator.py", line 363, in __init__
        self.make_property_type_cache()
      File "/usr/lib/python3/dist-packages/dtschema/validator.py", line 420, in make_property_type_cache
        self.props, self.pat_props = get_prop_types(self.schemas)
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/usr/lib/python3/dist-packages/dtschema/validator.py", line 187, in get_prop_types
        del props[r'^[a-z][a-z0-9\-]*$']
            ~~~~~^^^^^^^^^^^^^^^^^^^^^^^
    KeyError: '^[a-z][a-z0-9\\-]*$'
    make[2]: *** [Documentation/devicetree/bindings/Makefile:63: Documentation/devicetree/bindings/processed-schema.json] Error 1
    make[2]: *** Deleting file 'Documentation/devicetree/bindings/processed-schema.json'
    make[1]: *** Makefile:1509: dt_binding_schemas] Error 2
    make: *** [Makefile:251: __sub-make] Error 2

Tree: Linux Next next-20241212

DT schema:
$ apt list dt-schema*
dt-schema/unstable,unstable,now 2023.11-3 all [installed]

Library:
$ apt list python3-libfdt*
python3-libfdt/testing,testing,unstable,now 1.7.0-2+b2 amd64 [installed]

-- 
With Best Regards,
Andy Shevchenko