On Mon, Mar 27, 2017 at 10:12:24PM -0700, Brendan Higgins wrote:
> 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>;
Not documented and what's it for?
> + clocks = <&clk_apb>;
> + clock-frequency = <100000>;
> + status = "disabled";
Drop status from examples.
> + interrupts = <0>;
> + interrupt-parent = <&i2c_ic>;
> + };
> +};
> --
> 2.12.2.564.g063fe858b8-goog
>
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