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

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Date:   Thu, 23 Sep 2021 23:37:50 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [RFC PATCH v2 3/4] pinctrl: renesas: pinctrl-rzg2l: Add IRQ
 domain to handle GPIO interrupt

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