Added device tree binding documentation for Aspeed I2C Interrupt
Controller.

Signed-off-by: Brendan Higgins <brendanhigg...@google.com>
---
Added in v6:
  - Pulled "aspeed_i2c_controller" out into a interrupt controller since that is
    what it actually does.
Changes for v7:
  - None
Changes for v8:
  - None
---
 .../interrupt-controller/aspeed,ast2400-i2c-ic.txt | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/interrupt-controller/aspeed,ast2400-i2c-ic.txt

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
index 000000000000..033cc82e5684
--- /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;
+};
-- 
2.13.0.219.gdb65acc882-goog

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