[PATCH v4 0/4] gpio: realtek: Add support for Realtek DHC RTD1625

[Yu-Chun Lin]

This series adds GPIO support for the Realtek DHC RTD1625 SoC.

Unlike the existing driver (gpio-rtd.c) which uses shared bank registers,
the RTD1625 features a per-pin register architecture where each GPIO line
is managed by its own dedicated 32-bit control register. This distinct
hardware design requires a new, separate driver.

Best Regards,
Yu-Chun Lin
---
Patches 1-3 (fix, dt-bindings, and driver) are targeted for the GPIO tree.
Patch 4 (dts) will be taken via the Realtek SoC tree later. It is included
here for context.

Changes in v4:
- Reverted to the v2 approach (without gpio-regmap integration).
As a result, dropped patches 2, 3, and 4 from the v3 series.

Changes in Patch 3 (driver) since v2:
- IRQ handling fixes:
  - Added enum rtd1625_irq_index with named constants.
  - Documented the hardware quirk.
- Code cleanup and coding style improvements.
- Included the <linux/cleanup.h> header.
- Updated the copyright year.
- Retained Linus Walleij's Reviewed-by tag from v1, as the recent updates are
cleanups and fixes rather than major feature changes.
(Linus, please let me know if you have any concerns regarding this).

v3: https://lore.kernel.org/lkml/20260512033317.1602537-1-eleanor.lin@xxxxxxxxxxx/
v2: https://lore.kernel.org/lkml/20260408025243.1155482-1-eleanor.lin@xxxxxxxxxxx/
v1: https://lore.kernel.org/lkml/20260331113835.3510341-1-eleanor.lin@xxxxxxxxxxx/

Tzuyi Chang (2):
  dt-bindings: gpio: realtek: Add realtek,rtd1625-gpio
  gpio: realtek: Add driver for Realtek DHC RTD1625 SoC

Yu-Chun Lin (2):
  gpio: Replace "default y" with "default ARCH_REALTEK" in Kconfig
  arm64: dts: realtek: Add GPIO support for RTD1625

 .../bindings/gpio/realtek,rtd1625-gpio.yaml   |  71 ++
 arch/arm64/boot/dts/realtek/kent.dtsi         |  39 ++
 drivers/gpio/Kconfig                          |  14 +-
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-rtd1625.c                   | 611 ++++++++++++++++++
 5 files changed, 735 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/realtek,rtd1625-gpio.yaml
 create mode 100644 drivers/gpio/gpio-rtd1625.c

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2.43.0