irqchip: Add Loongson PCH PIC controller
This controller appears on Loongson LS7A family of PCH to transform interrupts from devices into HyperTransport vectorized interrrupts and send them to procrssor's HT vector controller. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200528152757.1028711-4-jiaxun.yang@flygoat.com
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