Re: [PATCH 02/12] dt-bindings: interrupt-controller: stm32-exti: Add irq nexus child node

[Rob Herring]

On Fri, Feb 16, 2024 at 10:47:47AM +0100, Antonio Borneo wrote:
> The mapping of EXTI interrupts to its parent interrupt controller
> is both SoC and instance dependent.
> The current implementation requires adding a new table to the
> driver's code and a new compatible for each new EXTI instance.
> 
> Add to the binding an interrupt nexus child node that will be
> used on the new EXTI instances and can be optionally used on the
> existing instances.
> The property 'interrupt-map' in the nexus node maps each EXTI
> interrupt to the parent interrupt.
> Align #address-cells and #interrupt-cells between the EXTI node
> and its nexus node.

Looks like an abuse of interrupt-map. You avoid adding yourself to the 
abuser list by putting it in a child node. Clever. (See list in 
drivers/of/irq.c if you don't know what I'm talking about)

I assume the EXTI has 0..N interrupts. Just define 'interrupts' with N 
entries with each entry mapping EXTI interrupt N to 'interrupts' entry 
N.

Rob