| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970 |
- From dae867771332e7541783ebb6bacf33356ad449b3 Mon Sep 17 00:00:00 2001
- From: John Crispin <[email protected]>
- Date: Thu, 31 Jan 2013 13:44:10 +0100
- Subject: [PATCH 12/79] Document: devicetree: add OF documents for MIPS
- interrupt controller
- Signed-off-by: John Crispin <[email protected]>
- Acked-by: David Daney <[email protected]>
- Patchwork: http://patchwork.linux-mips.org/patch/4901/
- ---
- Documentation/devicetree/bindings/mips/cpu_irq.txt | 47 ++++++++++++++++++++
- 1 file changed, 47 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/mips/cpu_irq.txt
- diff --git a/Documentation/devicetree/bindings/mips/cpu_irq.txt b/Documentation/devicetree/bindings/mips/cpu_irq.txt
- new file mode 100644
- index 0000000..13aa4b6
- --- /dev/null
- +++ b/Documentation/devicetree/bindings/mips/cpu_irq.txt
- @@ -0,0 +1,47 @@
- +MIPS CPU interrupt controller
- +
- +On MIPS the mips_cpu_intc_init() helper can be used to initialize the 8 CPU
- +IRQs from a devicetree file and create a irq_domain for IRQ controller.
- +
- +With the irq_domain in place we can describe how the 8 IRQs are wired to the
- +platforms internal interrupt controller cascade.
- +
- +Below is an example of a platform describing the cascade inside the devicetree
- +and the code used to load it inside arch_init_irq().
- +
- +Required properties:
- +- compatible : Should be "mti,cpu-interrupt-controller"
- +
- +Example devicetree:
- + cpu-irq: cpu-irq@0 {
- + #address-cells = <0>;
- +
- + interrupt-controller;
- + #interrupt-cells = <1>;
- +
- + compatible = "mti,cpu-interrupt-controller";
- + };
- +
- + intc: intc@200 {
- + compatible = "ralink,rt2880-intc";
- + reg = <0x200 0x100>;
- +
- + interrupt-controller;
- + #interrupt-cells = <1>;
- +
- + interrupt-parent = <&cpu-irq>;
- + interrupts = <2>;
- + };
- +
- +
- +Example platform irq.c:
- +static struct of_device_id __initdata of_irq_ids[] = {
- + { .compatible = "mti,cpu-interrupt-controller", .data = mips_cpu_intc_init },
- + { .compatible = "ralink,rt2880-intc", .data = intc_of_init },
- + {},
- +};
- +
- +void __init arch_init_irq(void)
- +{
- + of_irq_init(of_irq_ids);
- +}
- --
- 1.7.10.4
|
