43 lines
1.4 KiB
Text
43 lines
1.4 KiB
Text
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* Advanced Interrupt Controller (AIC)
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Required properties:
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- compatible: Should be "atmel,<chip>-aic"
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<chip> can be "at91rm9200", "sama5d3" or "sama5d4"
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- interrupt-controller: Identifies the node as an interrupt controller.
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- interrupt-parent: For single AIC system, it is an empty property.
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- #interrupt-cells: The number of cells to define the interrupts. It should be 3.
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The first cell is the IRQ number (aka "Peripheral IDentifier" on datasheet).
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The second cell is used to specify flags:
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bits[3:0] trigger type and level flags:
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1 = low-to-high edge triggered.
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2 = high-to-low edge triggered.
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4 = active high level-sensitive.
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8 = active low level-sensitive.
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Valid combinations are 1, 2, 3, 4, 8.
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Default flag for internal sources should be set to 4 (active high).
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The third cell is used to specify the irq priority from 0 (lowest) to 7
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(highest).
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- reg: Should contain AIC registers location and length
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- atmel,external-irqs: u32 array of external irqs.
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Examples:
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/*
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* AIC
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*/
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aic: interrupt-controller@fffff000 {
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compatible = "atmel,at91rm9200-aic";
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interrupt-controller;
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interrupt-parent;
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#interrupt-cells = <3>;
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reg = <0xfffff000 0x200>;
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};
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/*
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* An interrupt generating device that is wired to an AIC.
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*/
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dma: dma-controller@ffffec00 {
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compatible = "atmel,at91sam9g45-dma";
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reg = <0xffffec00 0x200>;
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interrupts = <21 4 5>;
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};
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