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References: <20211110225808.16388-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
In-Reply-To: <20211110225808.16388-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
From:   "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Date:   Mon, 22 Nov 2021 19:25:38 +0000
Message-ID: <CA+V-a8sCVkbwYeVGsQpv2q0OjwUSB_jqmjPptHN-ENSdU+pT1Q@mail.gmail.com>
Subject: Re: [RFC PATCH v3 0/7] Renesas RZ/G2L IRQC support
To:     Marc Zyngier <maz@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Rob Herring <robh+dt@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Magnus Damm <magnus.damm@gmail.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Biju Das <biju.das.jz@bp.renesas.com>
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Precedence: bulk

Hi Marc and Linus,

On Wed, Nov 10, 2021 at 10:58 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.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-IRQ8       |   IRQC   |------------>|        | |
> P0_P48_4 ------>| GPIO |---------------->|          |           | |________| |
>                 |      |GPIOINT0-122     |          |           |            |
>                 |      |---------------->| TINT0-31 |           |            |
>                 |______|                 |__________|           |____________|
>
> The proposed RFC patches, add the IRQ domains in GPIO (pinctrl driver) and the
> IRQC driver. The IRQC domain handles the actual SPI interrupt and upon reception
> of the interrupt it propagates to the GPIO IRQ domain to handle virq.
> Out of GPIOINT0-122 only 32 can be mapped to GIC SPI, this mapping is handled by
> the IRQC driver.
>
> Cheers,
> Prabhakar
>
> Changes for v3:
> -> Re-structured the driver as a hierarchical irq domain instead of chained
> -> made use of IRQCHIP_* macros
> -> dropped locking
> -> Added support for IRQ0-7 interrupts
> -> Introduced 2 new patches for GPIOLIB
> -> Switched to using GPIOLIB for irqdomains in pinctrl
>
Gentle ping.

Cheers,
Prabhakar

> RFC v2: https://patchwork.kernel.org/project/linux-renesas-soc/cover/
> 20210921193028.13099-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
> RFC v1: https://patchwork.kernel.org/project/linux-renesas-soc/cover/
> 20210803175109.1729-1-prabhakar.mahadev-lad.rj@bp.renesas.com/
>
> Lad Prabhakar (7):
>   dt-bindings: interrupt-controller: Add Renesas RZ/G2L Interrupt
>     Controller
>   irqchip: Add RZ/G2L IA55 Interrupt Controller driver
>   soc: renesas: Enable IRQC driver for RZ/G2L
>   gpio: gpiolib: Allow free() callback to be overridden
>   gpio: gpiolib: Add ngirq member to struct gpio_irq_chip
>   pinctrl: renesas: pinctrl-rzg2l: Add IRQ domain to handle GPIO
>     interrupt
>   arm64: dts: renesas: r9a07g044: Add IRQC node to SoC DTSI
>
>  .../renesas,rzg2l-irqc.yaml                   | 137 ++++++
>  arch/arm64/boot/dts/renesas/r9a07g044.dtsi    |  60 +++
>  drivers/gpio/gpiolib.c                        |  13 +-
>  drivers/irqchip/Kconfig                       |   8 +
>  drivers/irqchip/Makefile                      |   1 +
>  drivers/irqchip/irq-renesas-rzg2l.c           | 465 ++++++++++++++++++
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c       | 197 ++++++++
>  drivers/soc/renesas/Kconfig                   |   1 +
>  include/linux/gpio/driver.h                   |   8 +
>  9 files changed, 885 insertions(+), 5 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
>  create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c
>
> --
> 2.17.1
>