[PATCH 0/6] gpio: renesas: Add support for GPIO and related interrupts in RZ/N1 SoC

[Herve Codina <herve.codina@bootlin.com>]

Hi,

This series adds support for GPIO and GPIO IRQ mux available in the
RZ/N1 SoCs.

The first two patches of the series add support for GPIO (binding update
and device-tree description).

Other patches are related to GPIO interrupts and GPIO IRQ multiplexer.

In the RZ/N1 SoCs, GPIO interrupts are wired to a GPIO IRQ multiplexer.

This multiplexer does nothing but select 8 GPIO IRQ lines out of the 96
available to wire them to the GIC input lines.

One upstreaming attempt have been done previously by Phil Edworthy [1]
but the series has never been applied.

Based on my understanding, I have fully reworked the driver proposed by
Phil and removed the IRQ domain. Indeed, the device doesn't handle
interrupts. It just routes signals.

Also, as an interrupt-map property is used, the driver cannot be
involved as an interrupt controller itself. It is a nexus node.

With that in mind, patch 3 is related to the binding, patch 4 introduces
an helper to parse the interrupt-map property. This parsing is needed by
the driver. Indeed, the lines routing is defined by the interrupt-map
property and the driver needs to set registers to apply this routing.

The last two patches are the driver itself and the RZ/N1 device-tree
description update to have the support for the GPIO interrupts.

[1] https://lore.kernel.org/all/20190219155511.28507-1-phil.edworthy@renesas.com/

Best regards,
Hervé

Herve Codina (6):
  dt-bindings: gpio: snps,dw-apb: Add support for Renesas RZ/N1
  ARM: dts: r9a06g032: Add GPIO controllers
  dt-bindings: soc: renesas: Add the Renesas RZ/N1 GPIO Interrupt
    Multiplexer
  of/irq: Introduce of_irq_foreach_imap
  soc: renesas: Add support for Renesas RZ/N1 GPIO Interrupt Multiplexer
  ARM: dts: r9a06g032: Add support for GPIO interrupts

 .../bindings/gpio/snps,dw-apb-gpio.yaml       |   8 +-
 .../soc/renesas/renesas,rzn1-gpioirqmux.yaml  |  99 ++++++++++
 arch/arm/boot/dts/renesas/r9a06g032.dtsi      | 172 ++++++++++++++++++
 drivers/of/irq.c                              |  70 +++++++
 drivers/soc/renesas/Kconfig                   |   4 +
 drivers/soc/renesas/Makefile                  |   1 +
 drivers/soc/renesas/rzn1_irqmux.c             | 169 +++++++++++++++++
 include/linux/of_irq.h                        |  11 ++
 8 files changed, 533 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml
 create mode 100644 drivers/soc/renesas/rzn1_irqmux.c

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2.50.1