[PATCH 3/3] gpio: realtek: Add driver for Realtek DHC RTD1625 SoC

[Bartosz Golaszewski]

On Tue, 31 Mar 2026 13:38:35 +0200, Yu-Chun Lin <eleanor.lin at realtek.com> said:
> From: Tzuyi Chang <tychang at realtek.com>
>
> Add support for the GPIO controller found on Realtek DHC RTD1625 SoCs.
>
> Unlike the existing Realtek GPIO driver (drivers/gpio/gpio-rtd.c),
> which manages pins via shared bank registers, the RTD1625 introduces
> a per-pin register architecture. Each GPIO line now has its own
> dedicated 32-bit control register to manage configuration independently,
> including direction, output value, input value, interrupt enable, and
> debounce. Therefore, this distinct hardware design requires a separate
> driver.
>
> Signed-off-by: Tzuyi Chang <tychang at realtek.com>
> Signed-off-by: Yu-Chun Lin <eleanor.lin at realtek.com>
> ---
>  drivers/gpio/Kconfig        |  12 +
>  drivers/gpio/Makefile       |   1 +
>  drivers/gpio/gpio-rtd1625.c | 581 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 594 insertions(+)
>  create mode 100644 drivers/gpio/gpio-rtd1625.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index b45fb799e36c..6ffc95e02cb9 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -639,6 +639,18 @@ config GPIO_RTD
>  	  Say yes here to support GPIO functionality and GPIO interrupt on
>  	  Realtek DHC SoCs.
>
> +config GPIO_RTD1625
> +	tristate "Realtek DHC RTD1625 GPIO support"
> +	depends on ARCH_REALTEK || COMPILE_TEST
> +	default y

Don't default to y for COMPILE_TEST. If you need this for ARCH_REALTEK then
limit it to it. Though seeing as it's a module_initcall() anyway, maybe you
don't need it at all?

> +	select GPIOLIB_IRQCHIP
> +	help
> +	  This option enables support for the GPIO controller on Realtek
> +	  DHC (Digital Home Center) RTD1625 SoC.
> +
> +	  Say yes here to support both basic GPIO line functionality
> +	  and GPIO interrupt handling capabilities for this platform.
> +

Other than that looks really nice!

Bart