linux-kernel - Re: [PATCH v1 1/1] gpio: wcove: make irq

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Date:   Wed, 1 Jun 2022 08:51:03 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH v1 1/1] gpio: wcove: make irq_chip immutable



On 6/1/22 8:48 AM, Andy Shevchenko wrote:
> 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.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Looks good to me

Reviewed-by: Kuppuswamy Sathyanarayanan 
<sathyanarayanan.kuppuswamy@...ux.intel.com>

> ---
>   drivers/gpio/gpio-wcove.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-wcove.c b/drivers/gpio/gpio-wcove.c
> index 16a0fae1e32e..c18b6b47384f 100644
> --- a/drivers/gpio/gpio-wcove.c
> +++ b/drivers/gpio/gpio-wcove.c
> @@ -299,6 +299,8 @@ static void wcove_irq_unmask(struct irq_data *data)
>   	if (gpio >= WCOVE_GPIO_NUM)
>   		return;
>   
> +	gpiochip_enable_irq(chip, gpio);
> +
>   	wg->set_irq_mask = false;
>   	wg->update |= UPDATE_IRQ_MASK;
>   }
> @@ -314,15 +316,19 @@ static void wcove_irq_mask(struct irq_data *data)
>   
>   	wg->set_irq_mask = true;
>   	wg->update |= UPDATE_IRQ_MASK;
> +
> +	gpiochip_disable_irq(chip, gpio);
>   }
>   
> -static struct irq_chip wcove_irqchip = {
> +static const struct irq_chip wcove_irqchip = {
>   	.name			= "Whiskey Cove",
>   	.irq_mask		= wcove_irq_mask,
>   	.irq_unmask		= wcove_irq_unmask,
>   	.irq_set_type		= wcove_irq_type,
>   	.irq_bus_lock		= wcove_bus_lock,
>   	.irq_bus_sync_unlock	= wcove_bus_sync_unlock,
> +	.flags			= IRQCHIP_IMMUTABLE,
> +	GPIOCHIP_IRQ_RESOURCE_HELPERS,
>   };
>   
>   static irqreturn_t wcove_gpio_irq_handler(int irq, void *data)
> @@ -452,7 +458,7 @@ static int wcove_gpio_probe(struct platform_device *pdev)
>   	}
>   
>   	girq = &wg->chip.irq;
> -	girq->chip = &wcove_irqchip;
> +	gpio_irq_chip_set_chip(girq, &wcove_irqchip);
>   	/* This will let us handle the parent IRQ in the driver */
>   	girq->parent_handler = NULL;
>   	girq->num_parents = 0;

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer