Re: [PATCH 4/6] irqchip/renesas-rzv2h: Add CA55 software interrupt support

[Thomas Gleixner]

On Wed, Jan 21 2026 at 15:01, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>
> The Renesas RZ/V2H ICU provides a software interrupt register (ICU_SWINT)
> that allows software to explicitly assert interrupts toward individual
> CA55 cores. Writing BIT(n) to ICU_SWINT triggers the corresponding
> interrupt.
>
> Introduce a debug mechanism to trigger software interrupts on individual
> Cortex-A55 cores via the RZ/V2H ICU. The interface is gated behind
> CONFIG_DEBUG_FS and a module parameter to ensure it only exists when
> explicitly enabled.

Can't you reuse/extend the existing mechanism provided by
CONFIG_GENERIC_IRQ_INJECTION (irq_inject_interrupt(), irq_debug_write())
instead of implementing yet another ad hoc debugfs magic?

Thanks,

        tglx