How to use linear mapping without DT?
Hello, In fact, my question depends on sparse irq, irq domain and non DT.I have enabled sparse_irq use for at91 sub architecture. I don't know if it is the good solution... I won't like to use n_irqs in my machine descriptor. I think the goal of sparse irq is to allocate the irq descriptor only when the irq is used. It's better than allocating the range that can be managed by the controller which should be indicated by nr_irqs.
In this case using the legacy irq domain is not the right solution since I will have to allocate the range of irq managed by the controller. Moving to linear irq domain should be better. Moreover, I have seen that Grant may want to remove it.
So, how to move to linear irq domain? In DT case, all the interrupts into the DT are mapped so the irq descriptor is allocated and my device will have the right virq number. In non DT case, my device has an irq number corresponding to a fixed value (which is in fact the hwirq number) but probably not to any existing virq.
So how to get a valid virq? Do I have to call irq_create_mapping from my driver? It's probably not the right way... Should I keep legacy domain and set nr_irqs?
Thanks Regards Ludovic _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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