70 lines
2 KiB
Diff
70 lines
2 KiB
Diff
From dae867771332e7541783ebb6bacf33356ad449b3 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
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 <blogic@openwrt.org>
|
|
Acked-by: David Daney <david.daney@cavium.com>
|
|
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
|
|
|