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

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Message-ID: <20210316052743.aysh4sooz4s7rwqq@vireshk-i7>
Date:   Tue, 16 Mar 2021 10:57:43 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        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 16-03-21, 02:43, Masahiro Yamada wrote:
> On Mon, Mar 15, 2021 at 3:40 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > On 14-03-21, 20:16, Frank Rowand wrote:
> > What about doing this then in unittest's Makefile instead (which I
> > already suggested earlier), that will make everything work just fine
> > without any other changes ?
> >
> > +# Required for of unittest files as they can't be renamed to .dtso
> > +$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
> > +       $(call if_changed_dep,dtc)
> 
> If those rules are only needed by drivers/of/unittest-data/Makefile,
> they should not be located in scripts/Makefile.lib.

Right, this is exactly what I suggested.

> But how can we fix drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a779*.dts
> if these are doing bad things.
> They seem to be overlay files even though the file name suffix is .dts
> 
> $ find drivers -name '*.dts'
> drivers/staging/pi433/Documentation/devicetree/pi433-overlay.dts
> drivers/staging/mt7621-dts/gbpc2.dts
> drivers/staging/mt7621-dts/gbpc1.dts
> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts
> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts
> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts
> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts
> drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts

For all the above files, even if they are really overlay files, we
won't use fdtoverlay tool to apply them to some base dtb and so if we
leave them as is, i.e. .dts->.dtb, it won't break anything.

The problem only happens if someone wants to generate .dtbo for them
instead and then they should be named .dtso as we won't allow .dts ->
.dtbo conversion there.

-- 
viresh