This allows gpiolib to re-use ath9k's devicetree node as GPIO
controller.
Example:
ath9k: ath9k@0 {
#gpio-cells = <2>;
gpio-controller;
}
Now the ath9k node can be used just like any other GPIO controller:
gpios = <&ath9k 1 GPIO_ACTIVE_HIGH>;
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>