Messages in this thread Patch in this message | | | From | Thierry Reding <> | Subject | [PATCH] gpio: Describe interrupt-controller binding | Date | Tue, 18 Sep 2012 10:51:14 +0200 |
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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 <linus.walleij@stericsson.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Cc: devicetree-discuss@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> --- 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
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