Re: [PATCH v3 2/2] mfd: arizona: Convert GPIO IRQ handling to descriptors

[Lee Jones <lee@kernel.org>]

On Thu, 19 Mar 2026, Linus Walleij wrote:

> Convert the arizona polling GPIO handling to use a GPIO descripor
> instead of passing a global GPIO number as platform data.

s/descripor/descriptor/

> 
> This mechanism is not used in the kernel, but let's preserve
> the mechanism to be nice.
> 
> Users can define "irq-gpios" in the devicetree or software node
> for the Arizona chip to provide the GPIO line corresponding to
> the IRQ.
> 
> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
> Signed-off-by: Linus Walleij <linusw@kernel.org>
> ---
>  drivers/mfd/arizona-irq.c         | 45 ++++++++++++++++++---------------------
>  include/linux/mfd/arizona/core.h  |  2 ++
>  include/linux/mfd/arizona/pdata.h |  5 -----
>  3 files changed, 23 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-irq.c b/drivers/mfd/arizona-irq.c
> index 544016d420fe..b6f63031268e 100644
> --- a/drivers/mfd/arizona-irq.c
> +++ b/drivers/mfd/arizona-irq.c
> @@ -136,21 +136,19 @@ static irqreturn_t arizona_irq_thread(int irq, void *data)
>  			dev_err(arizona->dev,
>  				"Failed to read main IRQ status: %d\n", ret);
>  		}
> -#ifdef CONFIG_GPIOLIB_LEGACY
>  		/*
>  		 * Poll the IRQ pin status to see if we're really done
>  		 * if the interrupt controller can't do it for us.
>  		 */
> -		if (!arizona->pdata.irq_gpio) {
> +		if (!arizona->irq_gpiod) {
>  			break;
>  		} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING &&
> -			   gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
> +			   gpiod_get_value_cansleep(arizona->irq_gpiod)) {
>  			poll = true;
>  		} else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING &&
> -			   !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) {
> +			   !gpiod_get_value_cansleep(arizona->irq_gpiod)) {
>  			poll = true;
>  		}
> -#endif
>  	} while (poll);
>  
>  	pm_runtime_put_autosuspend(arizona->dev);
> @@ -350,27 +348,25 @@ int arizona_irq_init(struct arizona *arizona)
>  		goto err_map_main_irq;
>  	}
>  
> -#ifdef CONFIG_GPIOLIB_LEGACY
> -	/* Used to emulate edge trigger and to work around broken pinmux */
> -	if (arizona->pdata.irq_gpio) {
> -		if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) {
> -			dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n",
> -				 arizona->irq, arizona->pdata.irq_gpio,
> -				 gpio_to_irq(arizona->pdata.irq_gpio));
> -			arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio);
> -		}
> -
> -		ret = devm_gpio_request_one(arizona->dev,
> -					    arizona->pdata.irq_gpio,
> -					    GPIOF_IN, "arizona IRQ");
> -		if (ret != 0) {
> -			dev_err(arizona->dev,
> -				"Failed to request IRQ GPIO %d:: %d\n",
> -				arizona->pdata.irq_gpio, ret);
> -			arizona->pdata.irq_gpio = 0;
> +	/*
> +	 * Used to emulate edge trigger and to work around broken pinmux
> +	 * define "irq-gpios" in device tree or software node.
> +	 */
> +	arizona->irq_gpiod = devm_gpiod_get_optional(arizona->dev, "irq",
> +						     GPIOD_IN);
> +	if (IS_ERR(arizona->irq_gpiod)) {
> +		ret = PTR_ERR(arizona->irq_gpiod);
> +		dev_err(arizona->dev, "error getting IRQ GPIO (%d)\n", ret);

Since this function is called from the probe path and may return
-EPROBE_DEFER, should we use `dev_err_probe()` here to handle deferred
probing correctly?

> +		goto err_irq_gpiod;
> +	}
> +	if (arizona->irq_gpiod) {
> +		if (gpiod_to_irq(arizona->irq_gpiod) != arizona->irq) {
> +			dev_warn(arizona->dev, "IRQ %d is not right GPIO\n",
> +				 arizona->irq);

How about a little for info for the user:

  "IRQ %d does not match GPIO's IRQ %d"

> +			arizona->irq = gpiod_to_irq(arizona->irq_gpiod);
>  		}
> +		gpiod_set_consumer_name(arizona->irq_gpiod, "arizona IRQ");
>  	}
> -#endif
>  
>  	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
>  				   flags, "arizona", arizona);
> @@ -409,6 +405,7 @@ int arizona_irq_init(struct arizona *arizona)
>  	arizona_free_irq(arizona, ARIZONA_IRQ_BOOT_DONE, arizona);
>  err_boot_done:
>  	free_irq(arizona->irq, arizona);
> +err_irq_gpiod:
>  err_main_irq:
>  	regmap_del_irq_chip(irq_find_mapping(arizona->virq,
>  					     ARIZONA_MAIN_IRQ_INDEX),
> diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
> index 6d6f96b2b29f..7129651c9af6 100644
> --- a/include/linux/mfd/arizona/core.h
> +++ b/include/linux/mfd/arizona/core.h
> @@ -11,6 +11,7 @@
>  #define _WM_ARIZONA_CORE_H
>  
>  #include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/interrupt.h>
>  #include <linux/notifier.h>
>  #include <linux/regmap.h>
> @@ -136,6 +137,7 @@ struct arizona {
>  	struct irq_domain *virq;
>  	struct regmap_irq_chip_data *aod_irq_chip;
>  	struct regmap_irq_chip_data *irq_chip;
> +	struct gpio_desc *irq_gpiod;
>  
>  	bool hpdet_clamp;
>  	unsigned int hp_ena;
> diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
> index f72e6d4b14a7..20118bad869a 100644
> --- a/include/linux/mfd/arizona/pdata.h
> +++ b/include/linux/mfd/arizona/pdata.h
> @@ -188,11 +188,6 @@ struct arizona_pdata {
>  	/** Haptic actuator type */
>  	unsigned int hap_act;
>  
> -#ifdef CONFIG_GPIOLIB_LEGACY
> -	/** GPIO for primary IRQ (used for edge triggered emulation) */
> -	int irq_gpio;
> -#endif
> -
>  	/** General purpose switch control */
>  	unsigned int gpsw;
>  };
> 
> -- 
> 2.53.0
> 

-- 
Lee Jones [李琼斯]