Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
---
.../devicetree/bindings/gpio/gpio-aspeed.txt | 42 ++++++++++++++++++++++
1 file changed, 42 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
new file mode 100644
index 000000000000..1954b288cd49
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
@@ -0,0 +1,42 @@
+Aspeed GPIO controller Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- #gpio-cells : Should be two
+ - First cell is the GPIO line number
+ - Second cell is used to specify optional
+ parameters (unused)
+
+- compatible : Either "aspeed,ast2400-gpio" or "aspeed,ast2500-gpio"
+
+- reg : Address and length of the register set for the device
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupts : Interrupt specifier (see interrupt bindings for
+ details)
+
+Optional properties:
+- interrupt-controller : Marks the device node as an interrupt controller.
+- interrupt-parent : The parent interrupt controller, optional if inherited
+- #interrupt-cells : Should be 2. The first cell is the GPIO number.
+ The second cell bits[3:0] is used to specify 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.
+
+The gpio and interrupt properties are further described in their respective
+bindings documentation:
+
+- Documentation/devicetree/bindings/gpio/gpio.txt
+- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+ Example:
+ gpio@1e780000 {
+ #gpio-cells = <2>;
+ compatible = "aspeed,ast2400-gpio"
+ gpio-controller;
+ interrupt-parent = <&intc>;
+ interrupts = <20>;
+ reg = <0x1e780000 0x1000>;
+ };
--
2.7.4
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