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Subject: Re: [RFC PATCH 1/3] dtc: Add dtb build information option
To:     Steve McIntyre <steve.mcintyre@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        David Gibson <david@gibson.dropbear.id.au>,
        Frank Rowand <frowand.list@gmail.com>, <ian@freebsd.org>
CC:     Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Simon Glass <sjg@chromium.org>, <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Devicetree Compiler <devicetree-compiler@vger.kernel.org>
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 <20200120181708.GN3697@linaro.org>
From:   Alexandre Torgue <alexandre.torgue@st.com>
Message-ID: <9d83a36c-78c5-3452-bb48-209d68c46038@st.com>
Date:   Wed, 22 Jan 2020 19:00:18 +0100
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Hi

On 1/20/20 7:17 PM, Steve McIntyre wrote:
> On Fri, Jan 17, 2020 at 08:43:23AM -0600, Rob Herring wrote:
>> On Fri, Jan 17, 2020 at 6:26 AM David Gibson
>> <david@gibson.dropbear.id.au> wrote:
> 
> ...
> 
>>> What might be better would be to have a dtc option which force appends
>>> an extra .dts to the mail .dts compiled.  You can then put an overlay
>>> template in that file, something like:
>>>
>>> &{/} {
>>>          linux,build-info = /incbin/ "build-info.txt;
>>> }
>>
>> I like this suggestion either as an include another dts file or an
>> overlay. The latter could be useful as a way to maintain current dtb
>> files while splitting the source files into base and overlay dts
>> files.
> 
> ACK, that sounds like it could be helpful.
> 
>> But no, let's not prepend this with 'linux'. It's not a property
>> specific for Linux to consume.
> 
> Right. We might be seeing the data coming through from U-Boot (or any
> other random bootloader) too.
> 
> Cheers,
> 

Thanks for reviews. I gonna prepare a V2 with David proposition (to use 
overlay format) by keeping in mind not to modify existing dts(i) files.

Remaining questions are:

1- "build-info" or "linux,build-info"? IMO, If information is "generic" 
then first one should be used.

2- Looking at Franck proposition[1] some years ago and objections on it, 
do you think that this one could accepted ?

regards
Alex

[1] https://lore.kernel.org/linux-arm-kernel/550A42AC.8060104@gmail.com/