[PATCH v2 0/8] gpio: renesas: Add support for GPIO and related interrupts in RZ/N1 SoC

[Herve Codina (Schneider Electric)]

Hi,

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

The first patch of the series add support for GPIO (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 2 is related to the binding, patch 3 introduces
an helper (for_each_of_imap_item) 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.

Patch 4 adds a unittest for the new parsing helper. Patches 5 and 6
convert existing driver to use this helper.

The last two patches (patches 7 and 8) are the IRQ multiplexer 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@xxxxxxxxxxx/

Best regards,
Hervé

Changes v1 -> v2
  v1: https://lore.kernel.org/lkml/20250725152618.32886-1-herve.codina@xxxxxxxxxxx/

  Rebase on top of v6.17-rc5

  Patch 1 in v1
    - Removed in v2 (no need for RZ/N1 compatible strings).

  Patch 1 (2 in v1)
    - Fix node names (issue reported by Rob's bot)
    - Fix compatible RZ/N1 compatible strings
    - Removed undocumented and unused 'bank-name' properties

  Patch 2 (3 in v1)
   - Remove 'interrupts' property
   - Update 'interrupt-map' description

  Patch 3 (4 in v1)
   - Rework of_irq_foreach_imap() to provide the for_each_of_imap_item
     iterator (similar to for_each_of_range)

  Patch 4 (new in v2)
   - Add a unittest for for_each_of_imap_item

  Patch 5 (new in v2)
   - Convert irqchip/ls-extirq to use for_each_of_imap_item

  Patch 6 (new in v2)
   - Convert irqchip/renesas-rza1 to use for_each_of_imap_item

  Patch 7 (5 in v1)
   - Use for_each_of_imap_item
   - Remove 'interrupts' property usage

  Patch 8 (6 in v1)
   - Remove 'interrupts' property

Herve Codina (Schneider Electric) (8):
  ARM: dts: r9a06g032: Add GPIO controllers
  dt-bindings: soc: renesas: Add the Renesas RZ/N1 GPIO Interrupt
    Multiplexer
  of/irq: Introduce for_each_of_imap_item
  of: unittest: Add a test case for for_each_of_imap_item iterator
  irqchip/ls-extirq: Use for_each_of_imap_item iterator
  irqchip/renesas-rza1: Use for_each_of_imap_item iterator
  soc: renesas: Add support for Renesas RZ/N1 GPIO Interrupt Multiplexer
  ARM: dts: r9a06g032: Add support for GPIO interrupts

 .../soc/renesas/renesas,rzn1-gpioirqmux.yaml  |  86 +++++++++
 arch/arm/boot/dts/renesas/r9a06g032.dtsi      | 170 ++++++++++++++++++
 drivers/irqchip/irq-ls-extirq.c               |  47 ++---
 drivers/irqchip/irq-renesas-rza1.c            |  43 ++---
 drivers/of/irq.c                              |  70 ++++++++
 .../of/unittest-data/tests-interrupts.dtsi    |   9 +
 drivers/of/unittest.c                         | 116 ++++++++++++
 drivers/soc/renesas/Kconfig                   |   4 +
 drivers/soc/renesas/Makefile                  |   1 +
 drivers/soc/renesas/rzn1_irqmux.c             | 110 ++++++++++++
 include/linux/of_irq.h                        |  41 ++++-
 11 files changed, 639 insertions(+), 58 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/soc/renesas/renesas,rzn1-gpioirqmux.yaml
 create mode 100644 drivers/soc/renesas/rzn1_irqmux.c

-- 
2.51.0