On Wed, 28 May 2014 15:46:24 +0300, Pantelis Antoniou [off-list ref] wrote:

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

In the next version, can you include the patches you depend on that
aren't already in my tree?

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.

Good changes. This version is considerably better than the past one.
I've still got comments, but I'm a lot more comfortable with the
approach.

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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