linux-kernel - [RFC PATCH v2 0/4] Renesas RZ/G2L IRQC support

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Date:   Tue, 21 Sep 2021 20:30:24 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC PATCH v2 0/4] Renesas RZ/G2L IRQC support

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.

Current implementation only supports TINT interrupts.

Cheers,
Prabhakar

Changes for v2:
-> Re-structured the driver as a chained handler
-> Moved gpio verification to pinctrl driver
-> Added locks to protect read/write
-> Fixed propagating of irq (v1 queried the pinctrl irq domain to propagate)
-> To keep it simple dropped edge both support
-> Used relaxed accessors
-> Switched to use generic_handle_domain_irq()
-> Used irq_domain_translate_twocell() instead of custom callback

Lad Prabhakar (4):
  dt-bindings: interrupt-controller: Add Renesas RZ/G2L Interrupt
    Controller
  irqchip: Add RZ/G2L IA55 Interrupt Controller driver
  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                   | 130 ++++++
 arch/arm64/boot/dts/renesas/r9a07g044.dtsi    |  58 +++
 drivers/irqchip/Kconfig                       |   9 +
 drivers/irqchip/Makefile                      |   1 +
 drivers/irqchip/irq-renesas-rzg2l.c           | 393 ++++++++++++++++++
 drivers/pinctrl/renesas/pinctrl-rzg2l.c       | 214 ++++++++++
 drivers/soc/renesas/Kconfig                   |   1 +
 7 files changed, 806 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml
 create mode 100644 drivers/irqchip/irq-renesas-rzg2l.c

-- 
2.17.1