| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | * Xtensa built-in Programmable Interrupt Controller (PIC) |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: Should be "cdns,xtensa-pic". |
| 5 | - interrupt-controller: Identifies the node as an interrupt controller. |
| 6 | - #interrupt-cells: The number of cells to define the interrupts. |
| 7 | It may be either 1 or 2. |
| 8 | When it's 1, the first cell is the internal IRQ number. |
| 9 | When it's 2, the first cell is the IRQ number, and the second cell |
| 10 | specifies whether it's internal (0) or external (1). |
| 11 | Periferals are usually connected to a fixed external IRQ, but for different |
| 12 | core variants it may be mapped to different internal IRQ. |
| 13 | IRQ sensitivity and priority are fixed for each core variant and may not be |
| 14 | changed at runtime. |
| 15 | |
| 16 | Examples: |
| 17 | pic: pic { |
| 18 | compatible = "cdns,xtensa-pic"; |
| 19 | /* one cell: internal irq number, |
| 20 | * two cells: second cell == 0: internal irq number |
| 21 | * second cell == 1: external irq number |
| 22 | */ |
| 23 | #interrupt-cells = <2>; |
| 24 | interrupt-controller; |
| 25 | }; |