linux-kernel - Re: [PATCH] checkpatch: Warn if DT bindings are not in schema format

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Message-ID: <CAL_JsqLtEM9+LK=3YDLnoZbC1v09R9-qfFNEH-gTWj94FAjnyg@mail.gmail.com>
Date:   Fri, 27 Sep 2019 09:02:29 -0500
From:   Rob Herring <robh@...nel.org>
To:     Joe Perches <joe@...ches.com>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] checkpatch: Warn if DT bindings are not in schema format

On Fri, Sep 13, 2019 at 4:48 PM Joe Perches <joe@...ches.com> wrote:
>
> On Fri, 2019-09-13 at 16:13 -0500, Rob Herring wrote:
> > DT bindings are moving to using a json-schema based schema format
> > instead of freeform text. Add a checkpatch.pl check to encourage using
> > the schema for new bindings. It's not yet a requirement, but is
> > progressively being required by some maintainers.
> []
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
> > @@ -2822,6 +2822,14 @@ sub process {
> >                            "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
> >               }
> >
> > +# Check for adding new DT bindings not in schema format
> > +             if (!$in_commit_log &&
> > +                 ($line =~ /^new file mode\s*\d+\s*$/) &&
> > +                 ($realfile =~ m@...cumentation/devicetree/bindings/.*\.txt$@)) {
> > +                     WARN("DT_SCHEMA_BINDING_PATCH",
> > +                          "DT bindings should be in DT schema format. See: Documentation/devicetree/writing-schema.rst\n");
> > +             }
> > +
>
> As this already seems to be git dependent, perhaps

It's quite rare to see a non git generated diff these days.

> it's easier to read with a single line test like:
>
>                 if ($line =~ m{^\s*create mode\s*\d+\s*Documentation/devicetree/bindings/.*\.txt$}) {
>                         etc...
>                 }

I frequently do 'git show $commit | scripts/checkpatch.pl' and this
doesn't work with that. I really should have a '--pretty=email' in
there, but I just ignore the commit msg warnings. In any case, that
still doesn't help because there's no diffstat. There's probably some
way to turn that on or just use git-format-patch, but really we want
this to work with any git diff.

Rob