irqchip: ixp4xx: Add OF initialization support
This adds support for probing and settin up the IXP4xx irqchip from device tree. Cc: Jason Cooper <jason@lakedaemon.net> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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