linux-kernel - RE: [PATCH v3 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO interrupt

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Date:   Thu, 12 May 2022 17:59:11 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: RE: [PATCH v3 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to
 handle GPIO interrupt

Hi Prabhakar,

> Subject: Re: [PATCH v3 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain
> to handle GPIO interrupt
> 
> Hi Biju,
> 
> Thank you for the review.
> 
> On Thu, May 12, 2022 at 6:35 AM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> >
> > Hi Prabhakar,
> >
> > Thanks for the patch.
> >
> > > Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
> > > Subject: [PATCH v3 5/5] pinctrl: renesas: pinctrl-rzg2l: Add IRQ
> > > domain to handle GPIO interrupt
> > >
> > > 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.
> >
> > Do we need to update bindings with interrupt-cells on [1] like [2] as it
> act as parent for GPIO interrupts?
> >
> Yes interrupt-controller and interrupt-parent needs to be added. I'm
> wondering if "interrupt-cells" is not required. If the pin is an interrupt
> it will be passed as an GPIO.

It is same as external interrupt case right?

For eg:- Ethernet PHY case,

     interrupt-parent = <&irqc>;
     interrupts = <3 IRQ_TYPE_LEVEL_LOW>;

if you use GPIO, it will be like this right?

     interrupt-parent = <&pinctrl>;
     interrupts = <RZG2L_GPIO(43, 0) IRQ_TYPE_LEVEL_LOW>;

Cheers,
Biju






> 
> @Geert - your thoughts ?
> 
> Cheers,
> Prabhakar