linux-kernel - Need clarity on legacy RC interrupt handling

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Date:   Sat, 7 Jan 2017 07:54:40 +0530
From:   valmiki <valmikibow@...il.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Cc:     Marc Zyngier <marc.zyngier@....com>, helgaas@...nel.org,
        arnd@...db.de
Subject: Need clarity on legacy RC interrupt handling

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