linux-kernel - Re: [PATCH v3 1/1] pinctrl: renesas: rzt2h: add GPIO IRQ chip to handle interrupts

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Message-ID: <CAMuHMdUwzQSTk2ns2c_uXnER-jHXym2ep=u8t7yA1LuM+uwYZA@mail.gmail.com>
Date: Mon, 12 Jan 2026 14:45:09 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
Cc: Linus Walleij <linusw@...nel.org>, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] pinctrl: renesas: rzt2h: add GPIO IRQ chip to
 handle interrupts

On Fri, 9 Jan 2026 at 15:40, Cosmin Tanislav
<cosmin-gabriel.tanislav.xa@...esas.com> wrote:
> The Renesas RZ/T2H (R9A09G077) and Renesas RZ/N2H (R9A09G087) SoCs have
> IRQ-capable pins handled by the ICU, which forwards them to the GIC.
>
> The ICU supports 16 IRQ lines, the pins map to these lines arbitrarily,
> and the mapping is not configurable.
>
> Add a GPIO IRQ chip to the pin controller that can be used to configure
> these pins as IRQ lines.
>
> The pin controller places the requested pins into IRQ function,
> disabling GPIO mode. A hierarchical IRQ domain is used to forward other
> functionality to the parent IRQ domain, the ICU. The ICU does level
> translation and then forwards other functionality to the GIC.
>
> Wakeup capability is implemented by placing the entire pin controller on
> the wakeup path if any pins are requested to be wakeup-capable.
>
> Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
> ---
>
> V3:
>  * adjust comment describing the source of truth for the data inside
>    rzt2h_gpio_irq_map
>  * check if interrupt-controller property is present before populating
>    GPIO's IRQ chip
>  * move rzt2h_pinctrl_suspend_noirq() above rzt2h_pinctrl_pm_ops

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
i.e. will queue in renesas-pinctrl for v6.20.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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