linux-kernel - Re: [PATCH v7 0/5] Renesas RZ/G2L IRQC support

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Date:   Thu, 7 Jul 2022 18:51:37 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v7 0/5] Renesas RZ/G2L IRQC support

Hi Marc,

On Wed, Jul 6, 2022 at 8:02 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sun, 03 Jul 2022 20:40:15 +0100,
> Lad Prabhakar <prabhakar.csengg@...il.com> wrote:
> >
> > Hi All,
> >
> > The RZ/G2L Interrupt Controller is a front-end for the GIC found on
> > Renesas RZ/G2L SoC's with below pins:
> > - IRQ sense select for 8 external interrupts, mapped to 8 GIC SPI
> >   interrupts
> > - GPIO pins used as external interrupt input pins out of GPIOINT0-122 a
> >   maximum of only 32 can be mapped to 32 GIC SPI interrupts,
> > - NMI edge select.
> >
> >                                                              _____________
> >                                                              |    GIC     |
> >                                                              |  ________  |
> >                                       ____________           | |        | |
> > NMI --------------------------------->|          |  SPI0-479 | | GIC-600| |
> >              _______                  |          |------------>|        | |
> >              |      |                 |          |  PPI16-31 | |        | |
> >              |      | IRQ0-IRQ7       |   IRQC   |------------>|        | |
> > P0_P48_4 --->| GPIO |---------------->|          |           | |________| |
> >              |      |GPIOINT0-122     |          |           |            |
> >              |      |---------------->| TINT0-31 |           |            |
> >              |______|                 |__________|           |____________|
> >
> > The proposed patches add hierarchical IRQ domain, one in IRQC driver and
> > another in pinctrl driver. Upon interrupt requests map the interrupt to
> > GIC. Out of GPIOINT0-122 only 32 can be mapped to GIC SPI, this mapping is
> > handled by the pinctrl and IRQC driver.
> >
> > Cheers,
> > Prabhakar
> >
> > v6->v7:
> > * Used devm_reset_control_get_exclusive() instead of
> >   devm_reset_control_get_exclusive_by_index()
> > * Included RB tag from Linus for patch 5/5
> > * Switched to newer version of populate_parent_alloc_arg() (patch depends
> >   on https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/
> >   patch/?id=178b7e21459e9a7e2a2c369711ef0cc9b1cfbcd7)
>
> Please add this patch as part of the series.
>
Sure will do.

Cheers,
Prabhakar