Re: [RFC PATCH v2 3/4] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO interrupt

[Linus Walleij]

On Tue, Sep 21, 2021 at 9:30 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>

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