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Message-Id: <1348143410-32656-1-git-send-email-thierry.reding@avionic-design.de>
Date: Thu, 20 Sep 2012 14:16:50 +0200
From: Thierry Reding <thierry.reding@...onic-design.de>
To: Rob Herring <rob.herring@...xeda.com>
Cc: Linus Walleij <linus.walleij@...ricsson.com>,
Grant Likely <grant.likely@...retlab.ca>,
Stephen Warren <swarren@...dotorg.org>,
devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] dt: Document general interrupt controller bindings
In order to use a device as interrupt controller, it needs to be marked
with the DT interrupt-controller property. This commit adds rudimentary
documentation about the required standard properties and describes the
most commonly used interrupt specifiers.
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Stephen Warren <swarren@...dotorg.org>
Cc: devicetree-discuss@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Thierry Reding <thierry.reding@...onic-design.de>
---
Changes in v2:
- update interrupt client description as per Stephen's suggestions
- use an example for the two cell specifier where both the client and
the parent use two cell specifiers, as suggested by Rob, to reduce
the possibility for confusion
.../bindings/interrupt-controller/interrupts.txt | 95 ++++++++++++++++++++++
1 file changed, 95 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
diff --git a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
new file mode 100644
index 0000000..72a06c0
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
@@ -0,0 +1,95 @@
+Specifying interrupt information for devices
+============================================
+
+1) Interrupt client nodes
+-------------------------
+
+Nodes that describe devices which generate interrupts must contain an
+"interrupts" property. This property must contain a list of interrupt
+specifiers, one per output interrupt. The format of the interrupt specifier is
+determined by the interrupt controller to which the interrupts are routed; see
+section 2 below for details.
+
+The "interrupt-parent" property is used to specify the controller to which
+interrupts are routed and contains a single phandle referring to the interrupt
+controller node. This property is inherited, so it may be specified in an
+interrupt client node or in any of its parent nodes.
+
+2) Interrupt controller nodes
+-----------------------------
+
+A device is marked as an interrupt controller with the "interrupt-controller"
+property. This is a empty, boolean property. An additional "#interrupt-cells"
+property defines the number of cells needed to specify a single interrupt.
+
+It is the responsibility of the interrupt controller's binding to define the
+length and format of the interrupt specifier. The following two variants are
+commonly used:
+
+ a) one cell
+ -----------
+ The #interrupt-cells property is set to 1 and the single cell defines the
+ index of the interrupt within the controller.
+
+ Example:
+
+ vic: intc@...40000 {
+ compatible = "arm,versatile-vic";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ reg = <0x10140000 0x1000>;
+ };
+
+ sic: intc@...03000 {
+ compatible = "arm,versatile-sic";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ reg = <0x10003000 0x1000>;
+ interrupt-parent = <&vic>;
+ interrupts = <31>; /* Cascaded to vic */
+ };
+
+ b) two cells
+ ------------
+ The #interrupt-cells property is set to 2 and the first cell defines the
+ index of the interrupt within the controller, while the second cell is used
+ to specify any of the following flags:
+ - bits[3:0] trigger type and level flags
+ 1 = low-to-high edge triggered
+ 2 = high-to-low edge triggered
+ 4 = active high level-sensitive
+ 8 = active low level-sensitive
+
+ Example:
+
+ i2c@...0c000 {
+ gpioext: gpio-adnp@41 {
+ compatible = "ad,gpio-adnp";
+ reg = <0x41>;
+
+ interrupt-parent = <&gpio>;
+ interrupts = <160 1>;
+
+ gpio-controller;
+ #gpio-cells = <1>;
+
+ interrupt-controller;
+ #interrupt-cells = <2>;
+
+ nr-gpios = <64>;
+ };
+
+ sx8634@2b {
+ compatible = "smtc,sx8634";
+ reg = <0x2b>;
+
+ interrupt-parent = <&gpioext>;
+ interrupts = <3 0x8>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ threshold = <0x40>;
+ sensitivity = <7>;
+ };
+ };
--
1.7.12
--
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