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We can have multiple FDT irqchip drivers to be probed when a RISC-V system has different types of interrupt controller in a hierarchy. This will be certainly the case when a RISC-V system has both RISC-V AIA IMSIC and RISC-V AIA APLIC implemented. We extend simple FDT irqchip framework to allow multiple FDT irqchip drivers to be used for same RISC-V platform. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com>