linux-kernel - Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source files

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Message-ID: <20210310144730.5ipzeailoj6nno5h@vireshk-i7>
Date:   Wed, 10 Mar 2021 20:17:30 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Frank Rowand <frowand.list@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Anmar Oueja <anmar.oueja@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V11 3/5] kbuild: Allow .dtso format for overlay source
 files

On 10-03-21, 20:24, Masahiro Yamada wrote:
> On Wed, Mar 10, 2021 at 2:35 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> > index bc045a54a34e..59e86f67f9e0 100644
> > --- a/scripts/Makefile.lib
> > +++ b/scripts/Makefile.lib
> > @@ -339,7 +339,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
> >
> >  quiet_cmd_dtc = DTC     $@
> >  cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
> > -       $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
> > +       $(DTC) -I dts -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
> 
> Even without "-I dts",
> 
>    inform = guess_input_format(arg, "dts");
> 
> seems to fall back to "dts" anyway,

I missed this TBH.

> but I guess you wanted to make this explicit, correct?

That can be a reason now :)

> I will drop the ugly -O.
> https://patchwork.kernel.org/project/linux-kbuild/patch/20210310110824.782209-1-masahiroy@kernel.org/

But if we are going to depend on DTC to guess it right, then we
shouldn't add -I at all..

> I will queue it to linux-kbuild/fixes.
> 
> 
> 
> >                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
> >                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
> >         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
> > @@ -347,9 +347,13 @@ cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ;
> >  $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
> >         $(call if_changed_dep,dtc)
> >
> > +# Required for of unit-test files as they can't be renamed to .dtso
> 
> If you go with *.dtso, I think you will rename
> all *.dts under the drivers/ directory.
> 
> What is blocking you from making this consistent?

The unit-test dts files are designed differently (we have had lots of
discussion between Frank and David on that) and they aren't purely
overlay or base files. They are designed to do some tricky testing and
renaming them to .dtso won't be right, we are just reusing them to do
static (build time) testing as well.

I think it would be better if we can drop the existing %.dtbo rule
here (i.e. dtbo from .dts) and do some magic in unit-test's Makefile,
so it is localised at least instead of it here.

Any ideas for that ?
 
-- 
viresh