linux-kernel - Re: [PATCH 10/17] gpio: idt3243x: Convert to immutable irq

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Message-ID: <20230217132816.GA9335@alpha.franken.de>
Date:   Fri, 17 Feb 2023 14:28:16 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Mun Yew Tham <mun.yew.tham@...el.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, Alban Bedel <albeu@...e.fr>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Jay Fang <f.fangjian@...wei.com>,
        Daniel Palmer <daniel@...ngy.jp>,
        Romain Perier <romain.perier@...il.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        William Breathitt Gray <william.gray@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-omap@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 10/17] gpio: idt3243x: Convert to immutable irq_chip

On Thu, Feb 16, 2023 at 10:37:11AM +0100, Linus Walleij wrote:
> Convert the driver to immutable irq-chip with a bit of
> intuition.
> 
> Cc: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  drivers/gpio/gpio-idt3243x.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-idt3243x.c b/drivers/gpio/gpio-idt3243x.c
> index 1cafdf46f875..00f547d26254 100644
> --- a/drivers/gpio/gpio-idt3243x.c
> +++ b/drivers/gpio/gpio-idt3243x.c
> @@ -92,6 +92,8 @@ static void idt_gpio_mask(struct irq_data *d)
>  	writel(ctrl->mask_cache, ctrl->pic + IDT_PIC_IRQ_MASK);
>  
>  	raw_spin_unlock_irqrestore(&gc->bgpio_lock, flags);
> +
> +	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
>  }
>  
>  static void idt_gpio_unmask(struct irq_data *d)
> @@ -100,6 +102,7 @@ static void idt_gpio_unmask(struct irq_data *d)
>  	struct idt_gpio_ctrl *ctrl = gpiochip_get_data(gc);
>  	unsigned long flags;
>  
> +	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
>  	raw_spin_lock_irqsave(&gc->bgpio_lock, flags);
>  
>  	ctrl->mask_cache &= ~BIT(d->hwirq);
> @@ -119,12 +122,14 @@ static int idt_gpio_irq_init_hw(struct gpio_chip *gc)
>  	return 0;
>  }
>  
> -static struct irq_chip idt_gpio_irqchip = {
> +static const struct irq_chip idt_gpio_irqchip = {
>  	.name = "IDTGPIO",
>  	.irq_mask = idt_gpio_mask,
>  	.irq_ack = idt_gpio_ack,
>  	.irq_unmask = idt_gpio_unmask,
> -	.irq_set_type = idt_gpio_irq_set_type
> +	.irq_set_type = idt_gpio_irq_set_type,
> +	.flags = IRQCHIP_IMMUTABLE,
> +	GPIOCHIP_IRQ_RESOURCE_HELPERS,
>  };
>  
>  static int idt_gpio_probe(struct platform_device *pdev)
> @@ -168,7 +173,7 @@ static int idt_gpio_probe(struct platform_device *pdev)
>  			return parent_irq;
>  
>  		girq = &ctrl->gc.irq;
> -		girq->chip = &idt_gpio_irqchip;
> +		gpio_irq_chip_set_chip(girq, &idt_gpio_irqchip);
>  		girq->init_hw = idt_gpio_irq_init_hw;
>  		girq->parent_handler = idt_gpio_dispatch;
>  		girq->num_parents = 1;
> 
> -- 
> 2.34.1

Tested-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>


-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]