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

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Message-ID: <20210121234138.GB4400@yekko.fritz.box>
Date:   Fri, 22 Jan 2021 10:41:38 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        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 01:04:46AM -0600, Frank Rowand wrote:
> On 1/20/21 11:58 PM, Viresh Kumar wrote:
> > On 20-01-21, 23:55, Frank Rowand wrote:
> >> yes, but using the modified versions ("/plugin/;" removed) of
> >> testcases.dtb and overlay_base.dtb.
> > 
> > Okay, that would work fine I guess. I will try to implement this in
> > the new version.
> > 
> >> I apologize in advance if I get confused in these threads or cause confusion.
> >> I find myself going in circles and losing track of how things fit together as
> >> I move through the various pieces of unittest.
> > 
> > Me too :)
> > 
> > Today is the first time where we have some overlap in our work hours
> > (probably you working late :)), and we are able to get this sorted out
> > quickly enough.
> 
> Working quite late.  I swear I stopped working 3 hours ago and that was
> already late.
> 
> I reacted quite negatively to the attempt to restructure the unittest
> .dts file in the original patch.  Now after walking around the problem
> space a bit, and reviewing the ugly things that unittest.c does, and
> coming up with the approach of sed to copy and modify the two base
> .dts files, I think I finally have my head wrapped around an easier
> and cleaner approach than sed.
> 
> I'll describe it for just one of the two base files, but the same
> concept would apply to the other.  Don't take my file names as
> good suggestions, I am avoiding using the brain power to come up
> with good names at the moment.
> 
> 1) rename overlay_base.dts to overlay_base.dtsi
> 
> 2) remove "/dtgs-v1/" and "/plugin/:" from overlay_base.dtsi
> 
> 3) create a new overlay_base.dts:
>    // SPDX-License-Identifier: GPL-2.0
>    /dts-v1/;
>    /plugin/;
>    #include overlay_base_dtsi

"overlay_base" is a terrible name - it's not clear if it's supposed to
be a base tree or an overlay.  I'm still not seeing any reasonable
use for the plugin version either, fwiw.

> 
> 4) create a new file overlay_base_static.dts:
>    // SPDX-License-Identifier: GPL-2.0
>    /dts-v1/;
>    #include overlay_base_dtsi
> 
> 5) then use overlay_base_static.dtb as the base blob for ftdoverlay
>    applying overlay.dtb
> 
> Untested, hand typed, hopefully no typos.
> 
> -Frank
> 
> > 
> > Thanks for your feedback Frank.
> > 
> 

-- 
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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