gpio: zynq: Document interrupt-controller DT binding

HW and driver support the GPIO as interrupt-controller.
Document that in the DT binding.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
index db4c6a6..7b54265 100644 (file)
--- a/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-zynq.txt
@@ -12,6 +12,13 @@ Required properties:
 - interrupts           : Interrupt specifier (see interrupt bindings for
                          details)
 - interrupt-parent     : Must be core interrupt controller
+- interrupt-controller : Marks the device node as an interrupt controller.
+- #interrupt-cells     : Should be 2.  The first cell is the GPIO number.
+                         The second cell bits[3:0] is used to specify 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.
 - reg                  : Address and length of the register set for the device
 
 Example:
@@ -22,5 +29,7 @@ Example:
                gpio-controller;
                interrupt-parent = <&intc>;
                interrupts = <0 20 4>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
                reg = <0xe000a000 0x1000>;
        };