Re: [PATCH v2 14/25] dt-bindings: interrupt-controller: Add DT bindings for apple-aic

From: Marc Zyngier
Date: Tue Feb 16 2021 - 06:48:39 EST


On 2021-02-16 09:41, Arnd Bergmann wrote:
On Mon, Feb 15, 2021 at 1:17 PM Hector Martin <marcan@xxxxxxxxx> wrote:
+
+ The 2nd cell contains the interrupt number.
+ - HW IRQs: interrupt number
+ - FIQs:
+ - 0: physical HV timer
+ - 1: virtual HV timer
+ - 2: physical guest timer
+ - 3: virtual guest timer

I wonder if you could just model the FIQ as a single shared level interrupt
(which is essentially what it is), and have every driver that uses it do a
request_irq() on the same IRQ number.

And every driver would simply fail, because we don't allow sharing of
per-CPU interrupts.

M.
--
Jazz is not dead. It just smells funny...