On Tue, Sep 21, 2021 at 9:30 PM Lad Prabhakar
[off-list ref] wrote:

Add IRQ domian to RZ/G2L pinctrl driver to handle GPIO interrupt.

GPIO0-GPIO122 pins can be used as IRQ lines but only 32 pins can be
used as IRQ lines at given time. Selection of pins as IRQ lines
is handled by IA55 (which is the IRQC block) which sits in between the
GPIO and GIC.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Why can't you just use the hierarchical IRQ domain handling inside
gpiolib?

See for example drivers/gpio/gpio-ixp4xx.c for an example of how this
is used.

Yours,
Linus Walleij