On 09/18/2012 03:51 AM, Thierry Reding wrote:
> In order to use GPIO controllers as interrupt controllers, they need to
> be marked with the DT interrupt-controller property. This commit adds
> some documentation about this to the general GPIO binding document.
>
> Cc: Linus Walleij <[email protected]>
> Cc: Grant Likely <[email protected]>
> Cc: Rob Herring <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Thierry Reding <[email protected]>
Applied for 3.7.
Rob
> ---
> Documentation/devicetree/bindings/gpio/gpio.txt | 33
> +++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt
> b/Documentation/devicetree/bindings/gpio/gpio.txt
> index 4e16ba4..8d125b0 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio.txt
> @@ -75,4 +75,37 @@ Example of two SOC GPIO banks defined as gpio-controller
> nodes:
> gpio-controller;
> };
>
> +If the GPIO controller supports the generation of interrupts, it should
> +also contain an empty "interrupt-controller" property as well as an
> +"#interrupt-cells" property. This is required in order for other nodes
> +to use the GPIO controller as their interrupt parent.
>
> +If #interrupt-cells is 1, the single cell is used to specify the number
> +of the GPIO that is to be used as an interrupt.
> +
> +If #interrupt-cells is 2, the first cell is used to specify the number
> +of the GPIO that is to be used as an interrupt, whereas the second cell
> +is used to specify any of the following flags:
> + - bits[3:0] 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
> +
> +Example:
> +
> + gpioext: gpio-controller@41 {
> + compatible = "ad,gpio-adnp";
> + reg = <0x41>;
> +
> + interrupt-parent = <&gpio>;
> + interrupts = <160 1>;
> +
> + gpio-controller;
> + #gpio-cells = <2>;
> +
> + interrupt-controller;
> + #interrupt-cells = <2>;
> +
> + nr-gpios = <64>;
> + };
>
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