linux-kernel - Re: [PATCH 1/1] gpio: vf610: make irq

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Date:   Wed, 15 Feb 2023 12:19:33 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     andy.shevchenko@...il.com, Bartosz Golaszewski <brgl@...ev.pl>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] gpio: vf610: make irq_chip immutable

On Wed, Feb 15, 2023 at 12:09 PM Alexander Stein
<alexander.stein@...tq-group.com> wrote:
> Am Mittwoch, 15. Februar 2023, 11:18:06 CET schrieb Linus Walleij:
> > On Tue, Feb 14, 2023 at 11:52 AM <andy.shevchenko@...il.com> wrote:
> > > Tue, Feb 14, 2023 at 08:36:38AM +0100, Alexander Stein kirjoitti:
> > > > Since recently, the kernel is nagging about mutable irq_chips:
> > > >     "not an immutable chip, please consider fixing it!"
> > > >
> > > > Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
> > > > helper functions and call the appropriate gpiolib functions.
> > >
> > > ...
> > >
> > > > The overall changes are based on commit f1138dacb7ff
> > > > ("gpio: sch: make irq_chip immutable")
> > >
> > > Nice, but you forgot one crucial detail. You need to mark GPIO resuested
> > > whenever it's locked as IRQ and otherwise when unlocked.
> >
> > +static const struct irq_chip vf610_irqchip = {
> > (...)
> > +       GPIOCHIP_IRQ_RESOURCE_HELPERS,
> >
> > That's what this macro does ;)
>
> Does this mean the calls to gpiochip_disable_irq/gpiochip_enable_irq in v2/v3
> are not necessary?

No I guess I just misunderstood Andy's comments about "mark GPIO requested".
The callbacks to gpiolib are needed just like pointed out by Marc Z in his
answer, these callbacks are indeed needed.

Yours,
Linus Walleij