linux-kernel - Re: [PATCH v3 2/7] gpio: gpio-ep93xx: Fix single irqchip with multi gpiochips

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Date:   Thu, 28 Jan 2021 18:14:12 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/7] gpio: gpio-ep93xx: Fix single irqchip with multi gpiochips

On Thu, Jan 28, 2021 at 2:21 PM Nikita Shubin <nikita.shubin@...uefel.me> 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
> - reworked ep93xx_gpio_port to make it usable before chip_add_data
>   in ep93xx_init_irq_chips
>
> Fixes: d2b091961510 ("gpio: ep93xx: Pass irqchip when adding gpiochip")
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>

...

> +#define EP93XX_GPIO_IRQ_CHIPS_NUM 3
> +
>  struct ep93xx_gpio {
>         void __iomem            *base;
>         struct gpio_chip        gc[8];
> +       struct irq_chip         ic[EP93XX_GPIO_IRQ_CHIPS_NUM];
>  };

>  /* Port ordering is: A B F */
> +static const char * const irq_chip_names[] = {
> +       "gpio-irq-a",
> +       "gpio-irq-b",
> +       "gpio-irq-f",
> +};

Depending on the solution from the previous patch I would also go here
rather with holes, than messing up with mapping between port index and
index in this array.

-- 
With Best Regards,
Andy Shevchenko