[PATCH v4] kbuild: Add support for DT binding schema checks

[Geert Uytterhoeven]

Hi Rob,

On Sun, Jan 27, 2019 at 4:00 AM Rob Herring <robh at kernel.org> wrote:
> On Wed, Jan 23, 2019 at 9:33 AM Geert Uytterhoeven <geert at linux-m68k.org> wrote:
> > On Tue, Dec 11, 2018 at 9:24 PM Rob Herring <robh at kernel.org> wrote:
> > > This adds the build infrastructure for checking DT binding schema
> > > documents and validating dts files using the binding schema.
> > >
> > > Check DT binding schema documents:
> > > make dt_binding_check
> > >
> > > Build dts files and check using DT binding schema:
> > > make dtbs_check
> > >
> > > Optionally, DT_SCHEMA_FILES can be passed in with a schema file(s) to
> > > use for validation. This makes it easier to find and fix errors
> > > generated by a specific schema.
> > >
> > > Currently, the validation targets are separate from a normal build to
> > > avoid a hard dependency on the external DT schema project and because
> > > there are lots of warnings generated.
> >
> > Thanks, I'm giving this a try, and get errors like:
> >
> >       DTC     arch/arm/boot/dts/emev2-kzm9d.dt.yaml
> >     FATAL ERROR: No markers present in property 'cpu0' value
> >
> > and
> >
> >       DTC     arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dt.yaml
> >     FATAL ERROR: No markers present in property 'audio_clk_a' value
> >
> > Do you have a clue?
>
> That's really strange because those aren't even properties. Are other
> dts files okay? This is the in tree dtc?
>
> The only time you should be missing markers is if you did a dts -> dts
> -> dt.yaml.

Found it: make dtbs_check doesn't play well with my local change to
add symbols for DT overlays:

    --- a/scripts/Makefile.lib
    +++ b/scripts/Makefile.lib
    @@ -285,6 +285,10 @@ cmd_dt_S_dtb=
             \
     $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
            $(call if_changed,dt_S_dtb)

    +ifeq ($(CONFIG_OF_OVERLAY),y)
    +DTC_FLAGS += -@
    +endif
    +
     quiet_cmd_dtc = DTC     $@
     cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
            $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o
$(dtc-tmp) $< ; \

Do you see a way to handle that better?

Apart from a few expected issues, I'm seeing one other strange message:

    arch/arm/boot/dts/sh73a0-kzm9g.dt.yaml: interrupts: [[2, 4], [3,
4]] is too long

This is the interrupts property in the adi,adxl345 node in
arch/arm/boot/dts/sh73a0-kzm9g.dts.
Apparently the check complains if more than one interrupt is listed here.
Is this a known issue?

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds