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author | John Crispin <blogic@openwrt.org> | 2013-01-31 13:44:10 +0100 |
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committer | John Crispin <blogic@openwrt.org> | 2013-02-17 01:25:33 +0100 |
commit | dcc7310e144c3bf17a86d2f058d60fb525d4b34a (patch) | |
tree | c6d7813c6dac607e31a229c9d3b46ed4454c4061 | |
parent | 6d63d70f9fe4c1b3d293ac3b9d2fcaf937d95cea (diff) | |
download | op-kernel-dev-dcc7310e144c3bf17a86d2f058d60fb525d4b34a.zip op-kernel-dev-dcc7310e144c3bf17a86d2f058d60fb525d4b34a.tar.gz |
Document: devicetree: add OF documents for MIPS interrupt controller
Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: David Daney <david.daney@cavium.com>
Patchwork: http://patchwork.linux-mips.org/patch/4901/
-rw-r--r-- | Documentation/devicetree/bindings/mips/cpu_irq.txt | 47 |
1 files changed, 47 insertions, 0 deletions
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); +} |