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

[Rob Herring]

On Mon, Jan 28, 2019 at 3:43 AM Geert Uytterhoeven <geert at linux-m68k.org> wrote:
>
> Hi Rob,
>
> 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.
> >
> > Cc: Jonathan Corbet <corbet at lwn.net>
> > Cc: Mark Rutland <mark.rutland at arm.com>
> > Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> > Cc: Michal Marek <michal.lkml at markovi.net>
> > Cc: linux-doc at vger.kernel.org
> > Cc: devicetree at vger.kernel.org
> > Cc: linux-kbuild at vger.kernel.org
> > Signed-off-by: Rob Herring <robh at kernel.org>
>
> BTW, what are the CONFIG dependencies for this to work?
> E.g. defconfig on x86_64 fails, even after enabling CONFIG_OF:

I generally use allmodconfig which enables building all DTs.

Yes, there's a dependency on CONFIG_DTC which isn't always enabled
with CONFIG_OF. Maybe it should be. The only other solutions I've
thought of are either always build dtc or make the targets conditional
on CONFIG_DTC. The latter would only change the error message.

Rob