linux-kernel - Re: [PATCH] kbuild: Allow DTB overlays to built from .dtso named source files

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Date:   Fri, 21 Oct 2022 09:44:34 -0500
From:   Andrew Davis <afd@...com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        <devicetree@...r.kernel.org>, <linux-kbuild@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH] kbuild: Allow DTB overlays to built from .dtso named
 source files

On 10/21/22 1:52 AM, Geert Uytterhoeven wrote:
> Hi Rob,
> 
> On Fri, Oct 21, 2022 at 12:47 AM Rob Herring <robh+dt@...nel.org> wrote:
>> On Fri, Oct 14, 2022 at 10:13 AM Andrew Davis <afd@...com> wrote:
>>> Currently DTB Overlays (.dtbo) are build from source files with the same
>>> extension (.dts) as the base DTs (.dtb). This may become confusing and
>>> even lead to wrong results. For example, a composite DTB (created from a
>>> base DTB and a set of overlays) might have the same name as one of the
>>> overlays that create it.
>>>
>>> Different files should be generated from differently named sources.
>>>   .dtb  <-> .dts
>>>   .dtbo <-> .dtso
>>>
>>> We do not remove the ability to compile DTBO files from .dts files here,
>>> only add a new rule allowing the .dtso file name. The current .dts named
>>> overlays can be renamed with time. After all have been renamed we can
>>> remove the other rule.
>>
>> There was a patch from Geert converting everything. I'd rather not
>> support both ways.
> 
> Actually that was a patch from Frank?
> 

That series looks to have stalled?

It won't be easy to convert all the files in one go, especially with series
in-flight with both names, not sure how we avoid having both extensions for
at least one cycle. Plus having both allowed lets rename the existing files
in a more granular/bisectable way.

Thanks,
Andrew