1* Advanced Interrupt Controller (AIC) 2 3Required properties: 4- compatible: Should be "atmel,<chip>-aic" 5- interrupt-controller: Identifies the node as an interrupt controller. 6- interrupt-parent: For single AIC system, it is an empty property. 7- #interrupt-cells: The number of cells to define the interrupts. It should be 3. 8 The first cell is the IRQ number (aka "Peripheral IDentifier" on datasheet). 9 The second cell is used to specify flags: 10 bits[3:0] trigger type and level flags: 11 1 = low-to-high edge triggered. 12 2 = high-to-low edge triggered. 13 4 = active high level-sensitive. 14 8 = active low level-sensitive. 15 Valid combinations are 1, 2, 3, 4, 8. 16 Default flag for internal sources should be set to 4 (active high). 17 The third cell is used to specify the irq priority from 0 (lowest) to 7 18 (highest). 19- reg: Should contain AIC registers location and length 20- atmel,external-irqs: u32 array of external irqs. 21 22Examples: 23 /* 24 * AIC 25 */ 26 aic: interrupt-controller@fffff000 { 27 compatible = "atmel,at91rm9200-aic"; 28 interrupt-controller; 29 interrupt-parent; 30 #interrupt-cells = <3>; 31 reg = <0xfffff000 0x200>; 32 }; 33 34 /* 35 * An interrupt generating device that is wired to an AIC. 36 */ 37 dma: dma-controller@ffffec00 { 38 compatible = "atmel,at91sam9g45-dma"; 39 reg = <0xffffec00 0x200>; 40 interrupts = <21 4 5>; 41 }; 42