linux-kernel - [PATCH v5 0/9] Introducing (yet again) Device Tree Overlays

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Date:	Wed, 28 May 2014 15:46:24 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: [PATCH v5 0/9] Introducing (yet again) Device Tree Overlays

The following patchset introduces Device Tree overlays, a method
of dynamically altering the kernel's live Device Tree, along with
a generic interface to use it in a board agnostic manner.

It is against linux-next as of today 28/5/2014
"134a9c91121b1081bcf737045a11b0510c5c9dfb - Add linux-next specific files for 20140528"

It relies on the following previously submitted patches/patchsets:

* OF: Add [__]of_find_node_by_full_name
* OF: Utility helper functions for dynamic nodes

To compile overlays you need the DTC compiler patch

* "dtc: Dynamic symbols & fixup support (v2)"

Changes since V4:
* New API of_overlay_create/destroy being able to support stacked
overlays correctly.
* Removed use of notifiers internally.
* Removed own-grown bus handler notifiers; using already in-place DT
notification infrastructure.
* Split SPI notifier patch to one patch of generic changes and one
for DT overlay notifier.
* Removed unused overlay depth feature.
* Updated documentation.
* Moved configfs based interface to using the new API.
* Added overlay removal stacking tests.

Changes since V3:
* Added overlay self-tests.
* Fix bug in of_init_overlay_info (wrong sizeof)
* Platform bus handler handles parent_pdev == NULL
* of_resolve fixes according to comments by robh
  + changed if (foo == NULL) to if (!foo)
  + changed if (foo != NULL) to if (foo)
  + drivers/of/Kconfig added dep on OF && !SPARC
  + convert to using be32_to_cpup
  + u32 -> __be32 when modifying property values
  + cosmetic fixes

Changes since V2:
* Use of a configfs board agnostic overlay method
* Use of per bus handlers instead of hardcoded behaviour
* Optional target-path overlay target, which allows one to use standard
DTBs without resolution options.

Changes since V1:

* Removal of any bits related to a specific board (beaglebone).
* Introduced a platform agnostic interface using /proc/device-tree-overlay
* Various bug fixes related to i2c device handling have been squashed in.

Pantelis Antoniou (9):
  OF: Introduce Device Tree resolve support.
  OF: Introduce DT overlay support.
  OF: DT-Overlay configfs interface
  OF: platform: Add OF notifier handler
  of: i2c: Export single device registration method
  OF: i2c: Add OF notifier handler
  of: spi: Export single device registration method and accessors
  OF: spi: Add OF notifier handler
  OF: selftest: Add overlay self-test support.

 Documentation/devicetree/bindings/selftest.txt     |   14 +
 .../devicetree/dynamic-resolution-notes.txt        |   25 +
 Documentation/devicetree/overlay-notes.txt         |  160 ++++
 drivers/base/platform.c                            |   69 +-
 drivers/i2c/i2c-core.c                             |  165 +++-
 drivers/of/Kconfig                                 |   20 +
 drivers/of/Makefile                                |    3 +
 drivers/of/configfs.c                              |  251 +++++
 drivers/of/overlay.c                               | 1001 ++++++++++++++++++++
 drivers/of/resolver.c                              |  378 ++++++++
 drivers/of/selftest.c                              |  481 ++++++++++
 drivers/of/testcase-data/testcases.dtsi            |    1 +
 drivers/of/testcase-data/tests-overlay.dtsi        |  180 ++++
 drivers/spi/spi.c                                  |  323 +++++--
 include/linux/i2c.h                                |   10 +
 include/linux/of.h                                 |  167 ++++
 16 files changed, 3094 insertions(+), 154 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/selftest.txt
 create mode 100644 Documentation/devicetree/dynamic-resolution-notes.txt
 create mode 100644 Documentation/devicetree/overlay-notes.txt
 create mode 100644 drivers/of/configfs.c
 create mode 100644 drivers/of/overlay.c
 create mode 100644 drivers/of/resolver.c
 create mode 100644 drivers/of/testcase-data/tests-overlay.dtsi

-- 
1.7.12

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