linux-kernel - [RFC/PATCH 0/4] New style overlay and /expansion/ support

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Message-Id: <20170131000259.28576-1-stephen.boyd@linaro.org>
Date:   Mon, 30 Jan 2017 16:02:55 -0800
From:   Stephen Boyd <stephen.boyd@...aro.org>
To:     David Gibson <david@...son.dropbear.id.au>
Cc:     devicetree-compiler@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Grant Likely <grant.likely@...retlab.ca>,
        Mark Rutland <mark.rutland@....com>, mporter@...sulko.com,
        Koen Kooi <koen@...inion.thruhere.net>,
        Guenter Roeck <linux@...ck-us.net>, marex@...x.de,
        Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: [RFC/PATCH 0/4] New style overlay and /expansion/ support

This series revives the new style of overlay syntax that never got
merged. David said he wanted to handle it outside of the parse
phase[1], and he proposed a patch to move overlay application to the
livetree phase. I've applied that patch and reworked Pantelis' last
two patches for the new style "syntactic sugar" on top[2].

In addition, I've included the new /expansion/ keyword support for
overlays that don't reference any labels that are outside of the
input file. The new expansion keyword just transforms the unresolved
references into strings that go into a new 'target-alias' property
instead of the 'target' property. This is in line with what David
has proposed on the mailing list a few months ago[3].

RFC part: The current syntax requires a root node or overlays are rejected.
Making the root node optional would require some non-trivial rework of the
grammar to support it. This means the proposed 'new style' syntax doesn't
work without the root node.

[1] https://lkml.kernel.org/r/20161125041124.GB12287@umbus.fritz.box
[2] https://lkml.kernel.org/r/1481114903-8197-7-git-send-email-pantelis.antoniou@konsulko.com
[3] https://lkml.kernel.org/r/20160718142037.GS16769@voom.fritz.box

David Gibson (1):
  Start moving overlay handling from parser into dtc core

Pantelis Antoniou (1):
  tests: Add a test for overlays syntactic sugar

Stephen Boyd (2):
  dtc: Add syntactic sugar version of overlays
  dtc: Add /expansion/ support

 checks.c                         |  2 +-
 dtc-lexer.l                      |  6 +++
 dtc-parser.y                     | 68 +++++++++++++++++-----------------
 dtc.c                            | 16 +++++++-
 dtc.h                            | 20 +++++++++-
 flattree.c                       |  2 +-
 fstree.c                         |  2 +-
 livetree.c                       | 80 +++++++++++++++++++++++++++++++++++++++-
 tests/overlay_overlay_simple.dts |  3 ++
 tests/run_tests.sh               |  6 +++
 10 files changed, 163 insertions(+), 42 deletions(-)

-- 
2.10.0.297.gf6727b0