Added device tree binding documentation for Aspeed I2C busses.
Signed-off-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
---
Changes for v2:
- None
Changes for v3:
- Removed reference to "bus" device tree param
Changes for v4:
- None
Changes for v5:
- None
Changes for v6:
- Replaced the controller property with and interrupt controller, leaving only
the busses in the I2C documentation.
---
.../devicetree/bindings/i2c/i2c-aspeed.txt | 49 ++++++++++++++++++++++
1 file changed, 49 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 000000000000..fbcc501706b1
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
@@ -0,0 +1,49 @@
+Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.
+
+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"
+- clocks : root clock of bus, should reference the APB
+ clock
+- interrupts : interrupt number
+- interrupt-parent : interrupt controller for bus, should reference a
+ aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic
+ interrupt controller
+
+Optional Properties:
+- clock-frequency : frequency of the bus clock in Hz
+ defaults to 100 kHz when not specified
+
+Example:
+
+i2c {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x1e78a000 0x1000>;
+
+ i2c_ic: interrupt-controller@0 {
+ #interrupt-cells = <1>;
+ compatible = "aspeed,ast2400-i2c-ic";
+ reg = <0x0 0x40>;
+ interrupts = <12>;
+ interrupt-controller;
+ };
+
+ i2c0: i2c-bus@40 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ #interrupt-cells = <1>;
+ reg = <0x40 0x40>;
+ compatible = "aspeed,ast2400-i2c-bus";
+ bus = <0>;
+ clocks = <&clk_apb>;
+ clock-frequency = <100000>;
+ status = "disabled";
+ interrupts = <0>;
+ interrupt-parent = <&i2c_ic>;
+ };
+};
--
2.12.2.564.g063fe858b8-goog
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