linux-kernel - Re: [PATCH] pinctrl: nuvoton: wpcm450: Convert irqchip to IRQCHIP

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Date:   Tue, 7 Jun 2022 10:43:09 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        linux-gpio@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        openbmc@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: nuvoton: wpcm450: Convert irqchip to
 IRQCHIP_IMMUTABLE

On Tue, Jun 07, 2022 at 08:29:05AM +0100, Marc Zyngier wrote:
> On Mon, 06 Jun 2022 22:43:00 +0100,
> Jonathan Neuschäfer <j.neuschaefer@....net> wrote:
> > 
> > Commit 6c846d026d490 ("gpio: Don't fiddle with irqchips marked as
> > immutable") added a warning for irqchips that are not marked with
> > IRQCHIP_IMMUTABLE.
> > 
> > Convert the pinctrl-wpcm450 driver to an immutable irqchip.
> > 
> > Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> > ---
> >  drivers/pinctrl/nuvoton/pinctrl-wpcm450.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
> > index 0dbeb91f0bf27..cff784a7ce4d7 100644
> > --- a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
> > +++ b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
> > @@ -293,6 +293,8 @@ static const struct irq_chip wpcm450_gpio_irqchip = {
> >  	.irq_unmask = wpcm450_gpio_irq_unmask,
> >  	.irq_mask = wpcm450_gpio_irq_mask,
> >  	.irq_set_type = wpcm450_gpio_set_irq_type,
> > +	.flags = IRQCHIP_IMMUTABLE,
> > +	GPIOCHIP_IRQ_RESOURCE_HELPERS,
> >  };
> > 
> >  static void wpcm450_gpio_irqhandler(struct irq_desc *desc)
> > @@ -1068,9 +1070,8 @@ static int wpcm450_gpio_register(struct platform_device *pdev,
> >  		gpio->gc.fwnode = child;
> >  		gpio->gc.add_pin_ranges = wpcm450_gpio_add_pin_ranges;
> > 
> > -		gpio->irqc = wpcm450_gpio_irqchip;
> >  		girq = &gpio->gc.irq;
> > -		girq->chip = &gpio->irqc;
> > +		gpio_irq_chip_set_chip(girq, &wpcm450_gpio_irqchip);
> >  		girq->parent_handler = wpcm450_gpio_irqhandler;
> >  		girq->parents = devm_kcalloc(dev, WPCM450_NUM_GPIO_IRQS,
> >  					     sizeof(*girq->parents), GFP_KERNEL);
> 
> You are definitely missing the required updates to the mask/unmask
> methods, and you still have a now useless irq_chip structure in
> wpcm450_gpio.

Ah, true.

Thanks,
Jonathan

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