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PCI: mvebu: Implement support for legacy INTx interrupts
This adds support for legacy INTx interrupts received from other PCIe devices and which are reported by a new INTx irq chip. With this change, kernel can distinguish between INTA, INTB, INTC and INTD interrupts. Note that for this support, device tree files has to be properly adjusted to provide "interrupts" or "interrupts-extended" property with intx interrupt source, "interrupt-names" property with "intx" string and also 'interrupt-controller' subnode must be defined. If device tree files do not provide these nodes then driver would work as before. Link: https://lore.kernel.org/r/20220222155030.988-12-pali@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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