diff options
author | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 09:08:10 -0400 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 09:08:10 -0400 |
commit | 08cab72f91c8b28ffabfd143119bccdd4a115ad7 (patch) | |
tree | ccd5583971caecd82bf2d1e62691bf6e0362d650 /Documentation | |
parent | 86c1e5a74af11e4817ffa6d7748d9ac1353b5b53 (diff) | |
parent | f37a53cc5d8a8fb199e41386d125d8c2ed9e54ef (diff) |
Merge branch 'dt/gic' into next/dt
Conflicts:
arch/arm/include/asm/localtimer.h
arch/arm/mach-msm/board-msm8x60.c
arch/arm/mach-omap2/board-generic.c
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/arm/gic.txt | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt new file mode 100644 index 000000000000..52916b4aa1fe --- /dev/null +++ b/Documentation/devicetree/bindings/arm/gic.txt | |||
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1 | * ARM Generic Interrupt Controller | ||
2 | |||
3 | ARM SMP cores are often associated with a GIC, providing per processor | ||
4 | interrupts (PPI), shared processor interrupts (SPI) and software | ||
5 | generated interrupts (SGI). | ||
6 | |||
7 | Primary GIC is attached directly to the CPU and typically has PPIs and SGIs. | ||
8 | Secondary GICs are cascaded into the upward interrupt controller and do not | ||
9 | have PPIs or SGIs. | ||
10 | |||
11 | Main node required properties: | ||
12 | |||
13 | - compatible : should be one of: | ||
14 | "arm,cortex-a9-gic" | ||
15 | "arm,arm11mp-gic" | ||
16 | - interrupt-controller : Identifies the node as an interrupt controller | ||
17 | - #interrupt-cells : Specifies the number of cells needed to encode an | ||
18 | interrupt source. The type shall be a <u32> and the value shall be 3. | ||
19 | |||
20 | The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI | ||
21 | interrupts. | ||
22 | |||
23 | The 2nd cell contains the interrupt number for the interrupt type. | ||
24 | SPI interrupts are in the range [0-987]. PPI interrupts are in the | ||
25 | range [0-15]. | ||
26 | |||
27 | The 3rd cell is the flags, encoded as follows: | ||
28 | bits[3:0] trigger type and level flags. | ||
29 | 1 = low-to-high edge triggered | ||
30 | 2 = high-to-low edge triggered | ||
31 | 4 = active high level-sensitive | ||
32 | 8 = active low level-sensitive | ||
33 | bits[15:8] PPI interrupt cpu mask. Each bit corresponds to each of | ||
34 | the 8 possible cpus attached to the GIC. A bit set to '1' indicated | ||
35 | the interrupt is wired to that CPU. Only valid for PPI interrupts. | ||
36 | |||
37 | - reg : Specifies base physical address(s) and size of the GIC registers. The | ||
38 | first region is the GIC distributor register base and size. The 2nd region is | ||
39 | the GIC cpu interface register base and size. | ||
40 | |||
41 | Optional | ||
42 | - interrupts : Interrupt source of the parent interrupt controller. Only | ||
43 | present on secondary GICs. | ||
44 | |||
45 | Example: | ||
46 | |||
47 | intc: interrupt-controller@fff11000 { | ||
48 | compatible = "arm,cortex-a9-gic"; | ||
49 | #interrupt-cells = <3>; | ||
50 | #address-cells = <1>; | ||
51 | interrupt-controller; | ||
52 | reg = <0xfff11000 0x1000>, | ||
53 | <0xfff10100 0x100>; | ||
54 | }; | ||
55 | |||