pinctrl: sunxi: Add external interrupts support
The port controller IP found in the Allwinner A10 and A13 can use few of the pins it manage as an interrupt source, called external interrupts in the datasheet. The number of these external interrupts are SoCs specific, but the current upper limit is 32. In order to work, the external interrupts' pins have to be muxed to a specific function to generate an interrupt. This patch adds the irqchip and the needed logic to use the PIO controller as an interrupt controller. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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