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

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Date:   Thu, 21 Jan 2021 17:37:44 +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 Wed, Jan 20, 2021 at 11:55:08PM -0600, Frank Rowand wrote:
> On 1/20/21 11:43 PM, Viresh Kumar wrote:
> > Hi Frank,
> > 
> > On 20-01-21, 23:34, Frank Rowand wrote:
> >> It should be possible to apply this same concept to copying overlay_base.dts
> >> to overlay_base_base.dts, removing the "/plugin/;" from overlay_base_base.dts
> >> and using an additional rule to use fdtoverlay to apply overlay.dtb on top
> >> of overlay_base_base.dtb.
> > 
> > Are you suggesting to then merge this with testcases.dtb to get
> > static_test.dtb
> 
> no
> 
> > or keep two output files (static_test.dtb from
> > testcases.dtb + overlays and static_test2.dtb from overlay_base.dtb
> > and overlay.dtb) ?
> 
> yes, but using the modified versions ("/plugin/;" removed) of
> testcases.dtb and overlay_base.dtb.

I really don't understand why you want /plugin/ in *any* version of
testcases.dtb.
> > 
> > Asking because as I mentioned earlier, overlay_base.dtb doesn't have
> > __overlay__ property for its nodes and we can't apply that to
> > testcases.dtb using fdtoverlay.
> 
> Correct.
> 
> 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.
> 
> -Frank
> 
> > 
> >> Yes, overlay_base_base is a terrible name.  Just used to illustrate the point.
> >>
> >> I tried this by hand and am failing miserably.  But I am not using the proper
> >> environment (just a quick hack to see if the method might work).  So I would
> >> have to set things up properly to really test this.
> >>
> >> If this does work, it would remove my objections to you trying to transform
> >> the existing unittest .dts test data files (because you would not have to
> >> actually modify the existing .dts files).
> > 
> 

-- 
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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