Need clarity on legacy RC interrupt handling

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Hi,

Legacy interrupts are level triggered, but i see some RC drivers use flow handler "handle_simple_irq" instead why they are not using "handle_level_irq" ?

Why they are registering dummy_irq_chip with "handle_simple_irq", if they use this chip how the irq type is set for this virtual irq (level or edge).

Regards,
vamiki
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