On Fri, Sep 09, 2016 at 06:55:51PM -0700, Brendan Higgins wrote:
> Added device tree binding documentation for Aspeed I2C controller and
> busses.
> 
> Signed-off-by: Brendan Higgins <brendanhigg...@google.com>
> ---
> 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

Don't use indexes. The reg property is enough to id which bus is which.

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