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

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Date: Tue, 20 Feb 2024 09:07:02 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>, Thomas Gleixner <tglx@...utronix.de>, 
	Grygorii Strashko <grygorii.strashko@...com>
Cc: Théo Lebrun <theo.lebrun@...tlin.com>, 
	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 Mon, Feb 19, 2024 at 4:48 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> 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()?

I think this needs to be discussed with tglx if Grygorii is not available.

Yours,
Linus Walleij