linux-kernel - [PATCH v3 11/15] [NOT FOR MERGE] dt-bindings: Add a binding for a mailbox-backed interrupt controller

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Message-Id: <20190302042951.53671-12-samuel@sholland.org>
Date:   Fri,  1 Mar 2019 22:29:47 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Samuel Holland <samuel@...lland.org>
Subject: [PATCH v3 11/15] [NOT FOR MERGE] dt-bindings: Add a binding for a mailbox-backed interrupt controller

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 <samuel@...lland.org>
---
 .../interrupt-controller/mbox-intc.txt        | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 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
new file mode 100644
index 000000000000..a0eb7904ca83
--- /dev/null
+++ 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