linux-kernel - Re: [PATCH 16/23] gpio: nomadik: support shared GPIO IRQs

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Message-ID: <CAMRc=MdFBFFTYKHgDfOieNZJ+-x7ZZMiYty6buOp2J=eFUjt0Q@mail.gmail.com>
Date: Mon, 19 Feb 2024 16:48:04 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mips@...r.kernel.org, Gregory CLEMENT <gregory.clement@...tlin.com>, 
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 16/23] gpio: nomadik: support shared GPIO IRQs

On Wed, Feb 14, 2024 at 5:24 PM Théo Lebrun <theo.lebrun@...tlin.com> wrote:
>
> Support a single IRQs used by multiple GPIO banks. Change the IRQ
> handler type from a chained handler (as used by gpiolib
> for ->parent_handler) to a threaded IRQ.
>
> Use a fake raw spinlock to ensure generic_handle_irq() is called in a
> no-irq context. See Documentation/driver-api/gpio/driver.rst, "CHAINED
> CASCADED GPIO IRQCHIPS" for additional information.
>

Any reason for not using preempt_disable()?

Bart

[snip]