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SubjectRe: [RFC PATCH v3 0/7] Renesas RZ/G2L IRQC support
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
>

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