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

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Date:   Fri, 13 May 2022 06:12:12 +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



> -----Original Message-----
> From: Biju Das
> Sent: 12 May 2022 18:59
> 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-kernel@...r.kernel.org; linux-renesas-
> soc@...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(1, 0) IRQ_TYPE_LEVEL_LOW>;

FYI,

Previously, I have tested ADV HPD interrupt with below changes while investigating [1]

interrupt-parent = <&pinctrl>;                                   
interrupts = <RZG2L_GPIO(2, 1) IRQ_TYPE_EDGE_FALLING>;  

[1]  https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20220512&id=04b19d32213654e54ec819b6ac033360f1551902       

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