Re: [PATCH v8 9/9] gpio: realtek: Add driver for Realtek DHC RTD1625 SoC

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Mon Jul 27, 2026 at 3:04 PM CEST, Bartosz Golaszewski wrote:
> On Mon, 27 Jul 2026 13:23:24 +0200, Mathieu Dubois-Briand
> <mathieu.dubois-briand@bootlin.com> said:
>> On Mon Jul 27, 2026 at 1:10 PM CEST, Bartosz Golaszewski wrote:
>>> On Mon, 27 Jul 2026 10:20:35 +0200, Mathieu Dubois-Briand
>>> <mathieu.dubois-briand@bootlin.com> said:
>>>> On Sun Jul 26, 2026 at 2:52 PM CEST, Yu-Chun Lin wrote:
>>>>> From: Tzuyi Chang <tychang@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.
>>>>>
>>>>> The RTD1625 GPIO controller has a hardware quirk where both 'assert'
>>>>> and 'de-assert' interrupts are fired simultaneously on any edge toggle.
>>>>> The driver works around this quirk to correctly handle edge interrupts.
>>>>>
>>>>> Interrupt support is optional for this device, matching the dt-bindings.
>>>>> If the interrupts property is not provided, the driver simply skips IRQ
>>>>> initialization and operates purely as a basic GPIO controller.
>>>>>
>>>>> Reviewed-by: Linus Walleij <linusw@kernel.org>
>>>>> Signed-off-by: Tzuyi Chang <tychang@realtek.com>
>>>>> Co-developed-by: Yu-Chun Lin <eleanor.lin@realtek.com>
>>>>> Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
>>>>> ---
>>>>> Changes in v8:
>>>>> - Add error handlers in td1625_gpio_irq_handle().
>>>>> - Move the direction-checking logic from the core to our custom
>>>>> reg_mask_xlate() callback.
>>>>> - Add Reviewed-by tag from Linus.
>>>>> ---
>>>>
>>>> Thanks for the fixes.
>>>>
>>>> Reviewed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
>>>>
>>>
>>> Hi!
>>>
>>> Please leave series-wide tags under the cover letter, otherwise b4 will only
>>> apply it to the specific patch under which you commented.
>>>
>>> Bart
>>
>> Sorry, this was a patch-specific review, but the way I sent it was a bit
>> misleading.
>>
>
> Ah, no worries then. Is this series good to go now?
>
> Bart

It is good to go on my side, I made the comments I had.

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com