linux-kernel - Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using fdtoverlay

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Message-ID: <20210121063604.GK5174@yekko.fritz.box>
Date:   Thu, 21 Jan 2021 17:36:04 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org
Subject: Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using
 fdtoverlay

On Thu, Jan 21, 2021 at 11:20:40AM +0530, Viresh Kumar wrote:
> On 20-01-21, 23:45, Frank Rowand wrote:
> > I have only the most surface knowledge of fdtoverlay, mostly from
> > "fdtoverlay --help", but you can apply multiple overlays with a
> > single invocation of fdtoverlay.  My _assumption_ was that the
> > overlays would be applied in order, and after any given overlay
> > was applied, subsequent overlays could reference the previously
> > applied overlay.
> > 
> > Is my assumption incorrect?
> 
> I think yes, if everything is in order then it should work just fine.
> 
> I was only suggesting that fdtoverlay accepting the base overlay with
> /plugin/; may well be a requirement and so intentionally done.

No.  It's simply the result of the fact that a dtbo is still a dtb.
So, you can still apply an overlay to it.  However, a dtbo is a
weirdly structured dtb, so applying an overlay to it is very unlikely
to give you something useful.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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