irqchip: Add support for Realtek RTL838x/RTL839x interrupt controller
This is a standard IRQ driver with only status and mask registers. The mapping from SoC interrupts (18-31) to MIPS core interrupts is done via an interrupt-map in device tree. Signed-off-by: Bert Vermeulen <bert@biot.com> Signed-off-by: Birger Koblitz <mail@birger-koblitz.de> Acked-by: John Crispin <john@phrozen.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210122204224.509124-3-bert@biot.com
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