[PATCH] Documentation: Add device tree binding file for MOXA ART SoCs interrupt controller

[Jonas Jensen]

Add binding document for MOXA ART SoCs interrupt controller.

Signed-off-by: Jonas Jensen <jonas.jensen at gmail.com>
---

Notes:
    The MOXA ART irqchip driver was added without accompanying devicetree document.
    ( in next-20130716   drivers/irqchip/irq-moxart.c )
    
    Applies to next-20130716

 .../interrupt-controller/moxa,moxart-ic.txt        | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/moxa,moxart-ic.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/moxa,moxart-ic.txt b/Documentation/devicetree/bindings/interrupt-controller/moxa,moxart-ic.txt
new file mode 100644
index 0000000..58f1fe1
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/moxa,moxart-ic.txt
@@ -0,0 +1,28 @@
+* MOXA ART Interrupt Controller
+
+MOXA ART Interrupt Controller (moxart-ic) is used on MOXA ART SoCs
+and supports 32 non-configurable number of interrupts
+
+Main node required properties:
+
+- compatible : "moxa,moxart-ic"
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The type shall be a <u32> and the value shall be 2.
+
+  The first cell contains the interrupt number in the range [0-31].
+  The second cell contains the interrupt type
+
+- reg: physical base address and size of the intc registers map.
+- interrupt-mask: Specifies if the interrupt is edge or level-triggered
+  each bit represent an interrupt 0-31 where 1 signify edge
+
+Example:
+
+	intc: interrupt-controller at 98800000 {
+		compatible = "moxa,moxart-ic";
+		reg = <0x98800000 0x38>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		interrupt-mask = <0x00080000>;
+	};
-- 
1.8.2.1