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Date:   Tue, 5 Oct 2021 11:56:07 +0200
From:   Geert Uytterhoeven <>
To:     Linus Walleij <>
Cc:     Lad Prabhakar <>,
        Marc Zyngier <>,
        Thomas Gleixner <>,
        Geert Uytterhoeven <>,
        Rob Herring <>,
        Magnus Damm <>,
        "open list:GPIO SUBSYSTEM" <>,
        linux-kernel <>,
        Linux-Renesas <>,
        Prabhakar <>,
        Biju Das <>
Subject: Re: [RFC PATCH v2 3/4] pinctrl: renesas: pinctrl-rzg2l: Add IRQ
 domain to handle GPIO interrupt

Hi Linus,

On Thu, Sep 23, 2021 at 11:38 PM Linus Walleij <> wrote:
> On Tue, Sep 21, 2021 at 9:30 PM Lad Prabhakar
> <> 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 <>
> Why can't you just use the hierarchical IRQ domain handling inside
> gpiolib?

Out of interest (not related to this patch), does this support multiple
parent domains?




Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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