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]> --- 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>; + }; -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
