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This is the requirement so that _this_ driver returns > EPROBE_DEFER and *then* once the MSI domain driver is loaded as a module > (after boot) this driver is probed again and succeeds. Why module? for "riscv-aplic", "msi-parent" shall be "riscv-imsic" and it is "builtin_platform_driver", see drivers/irqchip/irq-riscv-imsic-platform.c Thanks, Vladimir