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of/irq: Document properties for wakeup interrupt parent

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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@codeaurora.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1573855915-9841-6-git-send-email-ilina@codeaurora.org
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Lina Iyer 2019-11-15 15:11:48 -07:00 committed by Marc Zyngier
parent 4a169a95d8
commit 09d31567f8
1 changed files with 12 additions and 0 deletions
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12
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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@ -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>;