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@stericsson.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

diff --git a/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt b/Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
new file mode 100644 (file)
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@10140000 {
+               compatible = "arm,versatile-vic";
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               reg = <0x10140000 0x1000>;
+       };
+
+       sic: intc@10003000 {
+               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@7000c000 {
+               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>;
+               };
+       };