linux-kernel - Re: [PATCH v3 2/2] Add GPIO support for Realtek DHC(Digital Home Center) RTD SoCs.

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Date: Mon, 18 Dec 2023 09:50:21 +0100
From: Michael Walle <michael@...le.cc>
To: TY_Chang[張子逸]
 <tychang@...ltek.com>
Cc: Andy Shevchenko <andy@...nel.org>, Linus Walleij
 <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring
 <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] Add GPIO support for Realtek DHC(Digital Home
 Center) RTD SoCs.

Hi,

> I have looked into regmap-irq, it appears that using the default irq
> thread_fn(regmap_irq_thread) is required. However, due to hardware 
> limitation,
> we need to inspect the IRQ_TYPE to determine whether to manage the irq 
> within
> the irq handler. I think our irq portion does not perfectly fit the 
> regmap-irq.
> Moreover, it seems that the gpio-regmap.c file needs to be modified if 
> the GPIO driver
> requires debounce settings. I think the gpio-regmap may not be 
> appropriate for our driver.
> Do you have any suggestions?

Can't say anything regarding the interrupt handling but adding literally
one line to gpio-regmap shouldn't be a reason not to use it.

-michael