Added device tree binding documentation for Aspeed I2C controller and
busses.

Signed-off-by: Brendan Higgins <redacted>
---
Changes for v2:
  - None
---
 .../devicetree/bindings/i2c/i2c-aspeed.txt         | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt

diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
new file mode 100644
index 0000000..df68f2a
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt

@@ -0,0 +1,63 @@
+Device tree configuration for the I2C controller and busses on the AST24XX
+and AST25XX SoCs.
+
+Controller:
+
+	Required Properties:
+	- #address-cells	: should be 1
+	- #size-cells 		: should be 1
+	- #interrupt-cells 	: should be 1
+	- compatible 		: should be "aspeed,ast2400-i2c-controller"
+				  or "aspeed,ast2500-i2c-controller"
+	- reg			: address start and range of controller
+	- ranges		: defines address offset and range for busses
+	- interrupts		: interrupt number
+	- clocks		: root clock of bus, should reference the APB
+				  clock
+	- clock-ranges		: specifies that child busses can inherit clocks
+	- interrupt-controller	: denotes that the controller receives and fires
+				  new interrupts for child busses
+
+Bus:
+
+	Required Properties:
+	- #address-cells	: should be 1
+	- #size-cells		: should be 0
+	- reg			: address offset and range of bus
+	- compatible		: should be "aspeed,ast2400-i2c-bus"
+				  or "aspeed,ast2500-i2c-bus"
+	- bus			: the bus's number