1*4882a593Smuzhiyun* Xtensa built-in Programmable Interrupt Controller (PIC)
2*4882a593Smuzhiyun
3*4882a593SmuzhiyunRequired properties:
4*4882a593Smuzhiyun- compatible: Should be "cdns,xtensa-pic".
5*4882a593Smuzhiyun- interrupt-controller: Identifies the node as an interrupt controller.
6*4882a593Smuzhiyun- #interrupt-cells: The number of cells to define the interrupts.
7*4882a593Smuzhiyun  It may be either 1 or 2.
8*4882a593Smuzhiyun  When it's 1, the first cell is the internal IRQ number.
9*4882a593Smuzhiyun  When it's 2, the first cell is the IRQ number, and the second cell
10*4882a593Smuzhiyun  specifies whether it's internal (0) or external (1).
11*4882a593Smuzhiyun  Periferals are usually connected to a fixed external IRQ, but for different
12*4882a593Smuzhiyun  core variants it may be mapped to different internal IRQ.
13*4882a593Smuzhiyun  IRQ sensitivity and priority are fixed for each core variant and may not be
14*4882a593Smuzhiyun  changed at runtime.
15*4882a593Smuzhiyun
16*4882a593SmuzhiyunExamples:
17*4882a593Smuzhiyun	pic: pic {
18*4882a593Smuzhiyun		compatible = "cdns,xtensa-pic";
19*4882a593Smuzhiyun		/* one cell: internal irq number,
20*4882a593Smuzhiyun		 * two cells: second cell == 0: internal irq number
21*4882a593Smuzhiyun		 *            second cell == 1: external irq number
22*4882a593Smuzhiyun		 */
23*4882a593Smuzhiyun		#interrupt-cells = <2>;
24*4882a593Smuzhiyun		interrupt-controller;
25*4882a593Smuzhiyun	};
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