irqchip: Move Tegra LIC to use stacked domains

This series is extracted from [4], which is trying to remove all traces of gic_arch_extn from the tree. As some maintainers are more responsive than others (understatement of the year...), I've decided to split it per sub-arch, and get it moving, at least partially.

This series addresses Tegra by moving its legacy interrupt controller support to drivers/irqchip and implementing a stacked domain on top of the standard GIC.

It is worth realizing that:

- I haven't been able to test this as much as I would have wanted to (it's only been tested on tegra2).

- This actively *breaks* existing setups. Once you boot a new kernel with an old DT, suspend/resume *will* be broken. Old kernels on a new DT won't even boot!

Based on 4.0-rc1.

* From v4: [4]
- Extracted from the full series
- Rebased on 4.0-rc1

* From v3 [3]:
- Rebased on top of the patch working around hardcoded IRQ on OMAP4/5 [4]
- Fixed more iMX6 DTs (Stephan)
- Fixed Exynos4/5 DTs

* From v2 [2]:
- Addressed numerous comments from Thierry
- Merged bug fixes from Nishanth
- Merged bug fix from Stefan

* From v1 [1]:
- Rebased on 3.19-rc3
- Fixed a number of additional platforms
- Added crossbar conversion to stacked domains
- Merged bug fixes from Nishanth

[4]: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/317531.html
[3]: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/315385.html
[2]: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/314041.html
[1]: http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/307338.html

Marc Zyngier (6):
ARM: tegra: irq: nuke leftovers from non-DT support
irqchip: tegra: add DT-based support for legacy interrupt controller
ARM: tegra: skip gic_arch_extn setup if DT has a LIC node
ARM: tegra: update DTs to expose legacy interrupt controller
DT: tegra: add binding for the legacy interrupt controller
ARM: tegra: remove old LIC support

 .../interrupt-controller/nvidia,tegra-ictlr.txt    |  43 +++
 arch/arm/boot/dts/tegra114.dtsi                    |  16 +-
 arch/arm/boot/dts/tegra124.dtsi                    |  16 +-
 arch/arm/boot/dts/tegra20.dtsi                     |  15 +-
 arch/arm/boot/dts/tegra30.dtsi                     |  16 +-
 arch/arm/mach-tegra/iomap.h                        |  15 -
 arch/arm/mach-tegra/irq.c                          | 209 +-----------
 arch/arm/mach-tegra/irq.h                          |   6 -
 arch/arm/mach-tegra/tegra.c                        |   1 -
 drivers/irqchip/Makefile                           |   1 +
 drivers/irqchip/irq-tegra.c                        | 368 +++++++++++++++++++++
 11 files changed, 479 insertions(+), 227 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/nvidia,tegra-ictlr.txt
 create mode 100644 drivers/irqchip/irq-tegra.c

2.1.4