irqchip/aspeed-i2c-ic: Add binding docs for Aspeed I2C Interrupt Controller

Added device tree binding documentation for Aspeed I2C Interrupt
Controller.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2400-i2c-ic.txt b/Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2400-i2c-ic.txt
new file mode 100644 (file)
index 0000000..033cc82
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2400-i2c-ic.txt
@@ -0,0 +1,25 @@
+Device tree configuration for the I2C Interrupt Controller on the AST24XX and
+AST25XX SoCs.
+
+Required Properties:
+- #address-cells       : should be 1
+- #size-cells          : should be 1
+- #interrupt-cells     : should be 1
+- compatible           : should be "aspeed,ast2400-i2c-ic"
+                         or "aspeed,ast2500-i2c-ic"
+- reg                  : address start and range of controller
+- interrupts           : interrupt number
+- interrupt-controller : denotes that the controller receives and fires
+                         new interrupts for child busses
+
+Example:
+
+i2c_ic: interrupt-controller@0 {
+       #address-cells = <1>;
+       #size-cells = <1>;
+       #interrupt-cells = <1>;
+       compatible = "aspeed,ast2400-i2c-ic";
+       reg = <0x0 0x40>;
+       interrupts = <12>;
+       interrupt-controller;
+};