On Thu, Jun 26, 2014 at 11:59:46PM +0100, Feng Kan wrote:
> Documentation for APM X-Gene SoC GPIO controller DTS binding.
>
> Signed-off-by: Feng Kan <[email protected]>
> Reviewed-by: Alexandre Courbot <[email protected]>
> ---
> .../devicetree/bindings/gpio/gpio-xgene.txt | 20
> ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-xgene.txt
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-xgene.txt
> b/Documentation/devicetree/bindings/gpio/gpio-xgene.txt
> new file mode 100644
> index 0000000..bd5fd85
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-xgene.txt
> @@ -0,0 +1,20 @@
> +APM X-Gene SoC GPIO controller bindings
> +
> +This is a gpio controller that is part of the flash controller.
> +This gpio controller controls a total of 48 gpios.
> +
> +Required properties:
> +- compatible: "apm,xgene-gpio" for X-Gene GPIO controller
> +- reg: Physical base address and size of the controller's registers
There is just the one bank?
> +- #gpio-cells: Should be two.
> + - first cell is the pin number
> + - second cell is used to specify optional parameters (unused)
Why is there an unused cell?
Why not just make this a single cell if the binding defines no valid
parameters?
> +- gpio-controller: Marks the device node as a GPIO controller.
No interrupts?
Thanks,
Mark.
> +
> +Example:
> + gpio0: gpio0@1701c000 {
> + compatible = "apm,xgene-gpio";
> + reg = <0x0 0x1701c000 0x0 0x40>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + };
> --
> 1.9.1
>
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