linux-kernel - Re: [PATCH] arm: dts: omap: Apply am57xx-idk overlays to base dtbs

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Date:   Fri, 22 Sep 2023 11:23:29 -0500
From:   Rob Herring <robh@...nel.org>
To:     Andrew Davis <afd@...com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Benoît Cousson <bcousson@...libre.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: dts: omap: Apply am57xx-idk overlays to base dtbs

On Fri, Sep 22, 2023 at 9:38 AM Andrew Davis <afd@...com> wrote:
>
> On 9/12/23 1:59 AM, Tony Lindgren wrote:
> > * Rob Herring <robh@...nel.org> [230911 21:46]:
> >> DT overlays in tree need to be applied to a base DTB to validate they
> >> apply, to run schema checks on them, and to catch any errors at compile
> >> time.
> >>
> >> Signed-off-by: Rob Herring <robh@...nel.org>
> >> ---
> >> Note that I have no idea if this combination of overlays makes sense.
> >
>
> It does make sense, but it is only one of many valid combinations. I'm
> guessing the goal here is just to make sure they all get applied in
> at least one way so the scheme check runs. In that case this is fine
> other than it might give the impression this is the only valid combinations.

I only care that an overlay is applied to one base. You should care
about any combination a user might do in a bootloader because who
wants to debug a failure a) on a board and b) in the bootloader.

> Also now we end up with these odd `am57{1,2}x-idk-overlays.dtb` files
> which also might confuse folks, I wonder if there is some way to
> apply and check, but not ship/install these..

There's already a config option, CONFIG_OF_ALL_DTBS, which adds
$(dtb-) entries to the build. So if you have "dtb- +=
foo-overlays.dtb" it will only be built in that case. Note that they'd
probably get installed too, but who installs allyesconfig builds.

Rob