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The Ralink GPIO driver supports irqchip function. Hence we need to add "interrupt-parent" and "interrupt-controller" properties to make sure it works properly. It is worth noting that all GPIO devices share the same interrupt line. Signed-off-by: Shiji Yang <yangshiji66@qq.com> Link: https://github.com/openwrt/openwrt/pull/16764 Signed-off-by: Robert Marko <robimarko@gmail.com>