Re: [PATCH v6 2/7] gpio: ep93xx: Fix single irqchip with multi gpiochips

[Alexander Sverdlin <alexander.sverdlin@gmail.com>]

Hello Nikita!

On Tue, 2021-02-09 at 16:31 +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@maquefel.me>

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

> ---
> v5->v6:
> - add devm_kasprintf() return value check and move it out from 
> ep93xx_init_irq_chip()
> - removed ep93xx_gpio_irq_chip
> - pass girq->chip instead of removed ep93xx_gpio_irq_chip to
> irq_set_chip_and_handler for port F
> ---
>  drivers/gpio/gpio-ep93xx.c | 30 +++++++++++++++++++-----------
>  1 file changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 64d6c2b4282e..94d9fa0d6aa7 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;
> @@ -263,15 +264,6 @@ static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
>         return 0;
>  }
>  
> -static struct irq_chip ep93xx_gpio_irq_chip = {
> -       .name           = "GPIO",
> -       .irq_ack        = ep93xx_gpio_irq_ack,
> -       .irq_mask_ack   = ep93xx_gpio_irq_mask_ack,
> -       .irq_mask       = ep93xx_gpio_irq_mask,
> -       .irq_unmask     = ep93xx_gpio_irq_unmask,
> -       .irq_set_type   = ep93xx_gpio_irq_type,
> -};
> -
>  /*************************************************************************
>   * gpiolib interface for EP93xx on-chip GPIOs
>   *************************************************************************/
> @@ -331,6 +323,15 @@ 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)
> +{
> +       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 +353,8 @@ 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 +362,12 @@ 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;
> +               ic->name = devm_kasprintf(dev, GFP_KERNEL, "gpio-irq-%s", bank->label);
> +               if (!ic->name)
> +                       return -ENOMEM;
> +               ep93xx_init_irq_chip(dev, ic);
> +               girq->chip = ic;
>         }
>  
>         if (bank->has_irq) {
> @@ -401,7 +409,7 @@ static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>                         gpio_irq = EP93XX_GPIO_F_IRQ_BASE + i;
>                         irq_set_chip_data(gpio_irq, &epg->gc[5]);
>                         irq_set_chip_and_handler(gpio_irq,
> -                                                &ep93xx_gpio_irq_chip,
> +                                                girq->chip,
>                                                  handle_level_irq);
>                         irq_clear_status_flags(gpio_irq, IRQ_NOREQUEST);
>                 }

-- 
Alexander Sverdlin.