ACPI graph support

Hello everyone, 

I posted a previous RFC labelled set of ACPI graph support a while ago: 

<URL:http://www.spinics.net/lists/linux-acpi/msg69547.html> 

Since then, the matter of how the properties should be used as in ACPI
_DSD was discussed in Ksummit and LPC, and a document detailing the rules 
was written [1].

I've additionally posted v1 which can be found here:

<URL:http://www.spinics.net/lists/linux-acpi/msg71661.html>

This set contains patches written by Mika Westerberg and by myself. The 
patchset brings support for graphs to ACPI. The functionality achieved by 
these patches is very similar to what the Device tree provides: the port
and the endpoint concept are being employed. The patches make use of the
_DSD property and data extensions to achieve this. The fwnode interface is
extended by graph functionality; this way graph information originating 
from both OF and ACPI may be accessed using the same interface, without 
being aware of the underlying firmware interface. 

The last patch of the set contains ASL documentation including an example.

The entire set may also be found here (on mediatree.git master, but it
also applies cleanly on linux-next):

<URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=acpi...> 

The resulting fwnode graph interface has been tested using V4L2 async with
fwnode matching and smiapp and omap3isp drivers, with appropriate changes 
to make use of the fwnode interface in drivers. 

The V4L2 patches can be found here. The fwnode graph interface is used by 
the newly added V4L2 fwnode framework which replaces the V4L2 OF
framework, with equivalent functionality. 

<URL:https://git.linuxtv.org/sailus/media_tree.git/log/?h=v4l2...>

changes since v1:

- Fix a few checkpatch.pl warnings in Mika's patches (too long lines),

- remove the "endpoint" property specifying the endpoint id. The endpoint
  id is a software concept and the index in the endpoint array can be used
  instead if needed. The changes are in patches "device property: Add
  support for fwnode endpoints" and "ACPI / DSD: Document references,
  ports and endpoints" and

- add patch "irqchip/gic: Add missing forward declaration for    
  struct device" (patch 9) to fix compilation warning on arm64 caused
  by "of: No need to include linux/property.h, linux/fwnode.h is
  sufficient" (now patch 10)

changes since RFC v1:

- Rebased the set --- there were a few conflicts. 

- Fixed a bug in ACPI graph parsing. (Thanks to Mika!)

- Remove one layer (the "ports" node) of the _DSD hierarchical data 
  structure. Change the documentation accordingly. Instead, rely on the 
  presence of "port" and "endpoint" properties to identify port and 
  endpoint nodes. 

- Add a reference the DSD property rule document [1]. 


Feedback is welcome.

-- 
Kind regards,
Sakari

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