[tip: irq/core] of/irq: Document properties for wakeup interrupt parent

[tip-bot2 for Lina Iyer]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     09d31567f85b6cd0eddf28d90f7b83be09ee282b
Gitweb:        https://git.kernel.org/tip/09d31567f85b6cd0eddf28d90f7b83be09ee282b
Author:        Lina Iyer <ilina@xxxxxxxxxxxxxx>
AuthorDate:    Fri, 15 Nov 2019 15:11:48 -07:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Sat, 16 Nov 2019 10:20:02 

of/irq: Document properties for wakeup interrupt parent

Some interrupt controllers in a SoC, are always powered on and have a
select interrupts routed to them, so that they can wakeup the SoC from
suspend. Add wakeup-parent DT property to refer to these interrupt
controllers.

Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1573855915-9841-6-git-send-email-ilina@xxxxxxxxxxxxxx
---
 Documentation/devicetree/bindings/interrupt-controller/interrupts.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
index 4a3ee25..4ebfa00 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
@@ -108,3 +108,15 @@ commonly used:
 			sensitivity = <7>;
 		};
 	};
+
+3) Interrupt wakeup parent
+--------------------------
+
+Some interrupt controllers in a SoC, are always powered on and have a select
+interrupts routed to them, so that they can wakeup the SoC from suspend. These
+interrupt controllers do not fall into the category of a parent interrupt
+controller and can be specified by the "wakeup-parent" property and contain a
+single phandle referring to the wakeup capable interrupt controller.
+
+   Example:
+	wakeup-parent = <&pdc_intc>;