[PATCH v5 0/2] Add gpio driver support for Realtek DHC SoCs

[Tzuyi Chang]

These patches add the bindings and the gpio driver for Realtek
DHC(Digital Home Center) RTD SoCs, including RTD1295, RTD1395,
RTD1619, RTD1319, RTD1619B, RTD1319D and RTD1315E.

Change log:
v4->v5:
1. Add more description in the Kconfig.
2. Add comment for the counter-intuitive number 31.
3. Convert to use cleanup API and module_platform_driver() macro.
4. Simplify some of the code as suggested in patch v4.
v3->v4:
1. Arrange the compatible list in alphanumerical order.
2. Remove the size check for the offset array.
3. Add the debounce callback.
4. Conducted a review of the critical section, employing raw_spinlock_t for locking purposes.
5. Add gpiochip_enable_irq/gpiochip_disable_irq to fulfill the immutability requirements.
6. Use irqd_to_hwirq to get hwirq.
v2->v3:
1. Remove generic compatible and use SoC-specific compatible instead.
2. Add the missing descriptions for the rtd_gpio_info structure members.
3. Assign gpio_chip fwnode.
v1->v2:
1. Add description for DHC RTD SoCs in the bindings.
2. Revise the compatible names in the bindings.
3. Transitioned from OF API to platform_device API.
4. Use u8 for the offset array within the rtd_gpio_info structure.
5. Record the size of each array within the rtd_gpio_info structure and
   implement checks to prevent out-of-bounds access.
6. Use GPIOLIB_IRQCHIP helpers to register interrupts.
7. Use dynamic allocation for GPIO base.

Tzuyi Chang (2):
  dt-bindings: gpio: realtek: Add realtek,rtd-gpio
  Add GPIO support for Realtek DHC(Digital Home Center) RTD SoCs.

 .../bindings/gpio/realtek,rtd-gpio.yaml       |  69 ++
 drivers/gpio/Kconfig                          |  13 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-rtd.c                       | 604 ++++++++++++++++++
 4 files changed, 687 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/realtek,rtd-gpio.yaml
 create mode 100644 drivers/gpio/gpio-rtd.c

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2.43.0