arm/tegra: convert tegra20 to GIC devicetree binding

Convert tegra20 IRQ intialization to the GIC devicetree binding. Modify the
interrupt definitions in the dts files according to
Documentation/devicetree/bindings/arm/gic.txt

v3 (swarren):
* Moved of_irq_init() call into board-dt.c to avoid ifdef'ing it.
  - Even with a dummy replacement if !CONFIG_OF, the reference from
    tegra_dt_irq_match[] to gic_of_init() would still have to be ifdef'd
  - It's plausible that tegra_dt_irq_match[] may need to contain more
    entries in the future, and defining what they are seems more suitable
    for board-dt.c than irq.c
v2 (swarren):
* Removed some stale GIC init code from board-dt.c
* Undid some accidental 0x -> 0x0 search/replace.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
[olof: added include of <asm/hardware/gic.h> for compile to pass]
Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/arm/mach-tegra/irq.c b/arch/arm/mach-tegra/irq.c
index 4956c3cea731..004b0fdf0d76 100644
--- a/arch/arm/mach-tegra/irq.c
+++ b/arch/arm/mach-tegra/irq.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
+#include <linux/of.h>
 
 #include <asm/hardware/gic.h>
 
@@ -129,6 +130,11 @@ void __init tegra_init_irq(void)
         gic_arch_extn.irq_unmask = tegra_unmask;
         gic_arch_extn.irq_retrigger = tegra_retrigger;
 
-        gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
-                 IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
+        /*
+         * Check if there is a devicetree present, since the GIC will be
+         * initialized elsewhere under DT.
+         */
+        if (!of_have_populated_dt())
+                gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
+                        IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
 }