linux-kernel - Re: [PATCH v5 2/7] gpio: ep93xx: Fix single irqchip with multi gpiochips

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Date:   Mon, 08 Feb 2021 16:48:17 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/7] gpio: ep93xx: Fix single irqchip with multi
 gpiochips

Hello Nikita,

On Mon, 2021-02-08 at 11:59 +0300, Nikita Shubin wrote:
> Fixes the following warnings which results in interrupts disabled on
> port B/F:
> 
> gpio gpiochip1: (B): detected irqchip that is shared with multiple gpiochips: please fix the driver.
> gpio gpiochip5: (F): detected irqchip that is shared with multiple gpiochips: please fix the driver.
> 
> - added separate irqchip for each interrupt capable gpiochip
> - provided unique names for each irqchip
> 
> Fixes: d2b091961510 ("gpio: ep93xx: Pass irqchip when adding gpiochip")
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>

I performed a bootup with the whole patch-series and
confirm that the warning is gone. Thank you for looking into this!

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> ---
> v4->v5:
> - generate IRQ chip's names dynamicaly from label
> ---
>  drivers/gpio/gpio-ep93xx.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 64d6c2b4282e..3d8eb8769470 100644
> --- a/drivers/gpio/gpio-ep93xx.c
> +++ b/drivers/gpio/gpio-ep93xx.c
> @@ -38,6 +38,7 @@
>  #define EP93XX_GPIO_F_IRQ_BASE 80
>  
>  struct ep93xx_gpio_irq_chip {
> +       struct irq_chip ic;
>         u8 irq_offset;
>         u8 int_unmasked;
>         u8 int_enabled;
> @@ -331,6 +332,16 @@ static int ep93xx_gpio_f_to_irq(struct gpio_chip *gc, unsigned offset)
>         return EP93XX_GPIO_F_IRQ_BASE + offset;
>  }
>  
> +static void ep93xx_init_irq_chip(struct device *dev, struct irq_chip *ic, const char *label)
> +{
> +       ic->name = devm_kasprintf(dev, GFP_KERNEL, "gpio-irq-%s", label);
> +       ic->irq_ack = ep93xx_gpio_irq_ack;
> +       ic->irq_mask_ack = ep93xx_gpio_irq_mask_ack;
> +       ic->irq_mask = ep93xx_gpio_irq_mask;
> +       ic->irq_unmask = ep93xx_gpio_irq_unmask;
> +       ic->irq_set_type = ep93xx_gpio_irq_type;
> +}
> +
>  static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>                                 struct platform_device *pdev,
>                                 struct ep93xx_gpio *epg,
> @@ -352,6 +363,8 @@ static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>  
>         girq = &gc->irq;
>         if (bank->has_irq || bank->has_hierarchical_irq) {
> +               struct irq_chip *ic;
> +
>                 gc->set_config = ep93xx_gpio_set_config;
>                 egc->eic = devm_kcalloc(dev, 1,
>                                         sizeof(*egc->eic),
> @@ -359,7 +372,9 @@ static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>                 if (!egc->eic)
>                         return -ENOMEM;
>                 egc->eic->irq_offset = bank->irq;
> -               girq->chip = &ep93xx_gpio_irq_chip;
> +               ic = &egc->eic->ic;
> +               ep93xx_init_irq_chip(dev, ic, bank->label);
> +               girq->chip = ic;
>         }
>  
>         if (bank->has_irq) {

-- 
Alexander Sverdlin.