File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/Documentation/devicetree/bindings/interrupt-controller/cdns,xtensa-pic.txt b/Documentation/devicetree/bindings/interrupt-controller/cdns,xtensa-pic.txt
new file mode 100644
index 0000000..026ef4c
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/cdns,xtensa-pic.txt
@@ -0,0 +1,25 @@
+* Xtensa built-in Programmable Interrupt Controller (PIC)
+
+Required properties:
+- compatible: Should be "cdns,xtensa-pic".
+- interrupt-controller: Identifies the node as an interrupt controller.
+- #interrupt-cells: The number of cells to define the interrupts.
+ It may be either 1 or 2.
+ When it's 1, the first cell is the internal IRQ number.
+ When it's 2, the first cell is the IRQ number, and the second cell
+ specifies whether it's internal (0) or external (1).
+ Periferals are usually connected to a fixed external IRQ, but for different
+ core variants it may be mapped to different internal IRQ.
+ IRQ sensitivity and priority are fixed for each core variant and may not be
+ changed at runtime.
+
+Examples:
+ pic: pic {
+ compatible = "cdns,xtensa-pic";
+ /* one cell: internal irq number,
+ * two cells: second cell == 0: internal irq number
+ * second cell == 1: external irq number
+ */
+ #interrupt-cells = <2>;
+ interrupt-controller;
+ };