linux-kernel - Re: [RFC v7 5/6] gpio: mpfs: pass gpio line number as irq data

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Message-ID: <20240806-baking-frustrate-32d0af5ed39c@spud>
Date: Tue, 6 Aug 2024 18:24:24 +0100
From: Conor Dooley <conor@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Conor Dooley <conor.dooley@...rochip.com>, linux-kernel@...r.kernel.org,
	Marc Zyngier <maz@...nel.org>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [RFC v7 5/6] gpio: mpfs: pass gpio line number as irq data

On Mon, Aug 05, 2024 at 10:11:09AM +0200, Linus Walleij wrote:
> Hi Conor,
> 
> thanks for your patch!
> 
> On Tue, Jul 23, 2024 at 1:28 PM Conor Dooley <conor.dooley@...rochip.com> wrote:
> 
> > Since the interrupt mux is going to provide us a 1:1 mapping for
> > interrupts, and it is no longer correct to hit all of the set bits in
> > the interrupt handler, store the GPIO that "owns" an interrupt in its
> > data pointer, so that we can determine which bit to clear.
> >
> > Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> 
> I don't quite get this, the irqchip of the GPIO is clearly hard-coded
> hierarchical, then why don't you:
> 
> select IRQ_DOMAIN_HIERARCHY
> 
> And use e.g. girq->child_to_parent_hwirq() to handle the
> hierarchy?
> 
> See drivers/gpio/gpio-ixp4xx.c for a simple example of a hierarchical
> GPIO interrupt controller.

Cool, I'll check that out. I've got some re-figuring out of the
interrupt controller to do given Thomas' comment there. Maybe the
combination will solve the horrible % 32 hack...

Cheers,
Conor.

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