This is a somewhat generic binding for an interrupt controller/forwarder
implemented in firmware and communicated with using a mailbox.
Signed-off-by: Samuel Holland <sam...@sholland.org>
---
.../interrupt-controller/mbox-intc.txt | 33 +++++++++++++++++++
1 file changed, 33 insertions(+)
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Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
diff --git
a/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
b/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
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+++ b/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
@@ -0,0 +1,33 @@
+Mailbox-backed Interrupt Controller
+===================================
+
+This binding represents an interrupt controller implemented in firmware,
+that uses a mailbox channel to signal and acknowledge interrupts.
+
+Device Node:
+============
+
+Required properties:
+--------------------
+- compatible: Must be one of the following strings:
+ - allwinner,sunxi-msgbox-intc
+- interrupt-controller: Signifies that this node is an interrupt
controller.
+- #interrupt-cells: Must be 1.
+- mboxes: phandle for the mailbox controller and channel
+ specifier. If the mailbox controller has unidirectional
+ channels, two entries are required (see below).
+- mbox-names: Only required for unidirectional mailbox channels. In
+ that case, it must contain the strings "tx" and "rx"
+ (where "tx" and "rx" are from Linux's perspective, not
+ the direction the interrupts are traveling).
+
+Example:
+--------
+
+ msgbox_intc: interrupt-controller {
+ compatible = "allwinner,sunxi-msgbox-intc";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ mboxes = <&msgbox 6>, <&msgbox 7>;
+ mbox-names = "tx", "rx";
+ };
--
2.19.2
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