linux-kernel - Re: [PATCH v2 0/6] of: overlays: New target methods

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Date:	Thu, 26 May 2016 14:15:46 -0700
From:	Frank Rowand <frowand.list@...il.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
CC:	Rob Herring <robherring2@...il.com>,
	Matt Porter <mporter@...sulko.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH v2 0/6]  of: overlays: New target methods

On 5/16/2016 1:18 PM, Pantelis Antoniou wrote:
> This patchset implements two new target methods.
> 
> A target index method which allows selecting different
> targets according to an argument using an extended API and
> a target root method that fences the target only
> to a specific given root.
> 
> Documentation and unit-tests are included.

I think you are attacking the problem the wrong way.

If I understand correctly, the problem statement is:

  In some cases, a devicetree overlay is meant to describe
  a pluggable piece of hardware, which may be plugged into
  various locations on a platform.  It should be possible
  to apply a single devicetree to one or more locations
  on a given platform.

If that is the case, then putting the locations where the
overlay can be applied into the devicetree is not the
approach that I would use.  It seems it would be better
to specify the target location as a separate item from
the overlay to the method that applies the devicetree.
In that case, I would put the node(s) describing the
pluggable hardware in the root node of the overlay
devicetree (dtc expects a root node).  The apply
method can easily find the node(s) and relocate them
to the appropriate location in the platform's
devicetree.

-Frank