linux-kernel - Re: [PATCH v1 2/3] gpio: ep93xx: Make irqchip immutable

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Message-ID: <CAMRc=Mf1p0-7T6Wc85u_NGpO7e8fLW=MJX44OjTazAPxXCeoxA@mail.gmail.com>
Date:   Wed, 25 Jan 2023 13:45:00 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     linux-gpio@...r.kernel.org,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Lukasz Majewski <lukma@...x.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] gpio: ep93xx: Make irqchip immutable

On Wed, Jan 25, 2023 at 9:30 AM Nikita Shubin <nikita.shubin@...uefel.me> wrote:
>
> This turns the Cirrus ep93xx gpio irqchip immutable.
>
> Preserve per-chip labels by adding an ->irq_print_chip() callback.
>
> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
> ---
> Bartosz Golaszewski, Linus Walleij:
>
> This could come togather with some refactoring and replacing
> all 'd->irq & 7' to 'irqd_to_hwirq', bu this comes in following
> patch.
> ---
>  drivers/gpio/gpio-ep93xx.c | 34 +++++++++++++++++++++-------------
>  1 file changed, 21 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 7edcdc575080..192be99b1392 100644
> --- a/drivers/gpio/gpio-ep93xx.c
> +++ b/drivers/gpio/gpio-ep93xx.c
> @@ -17,6 +17,7 @@
>  #include <linux/slab.h>
>  #include <linux/gpio/driver.h>
>  #include <linux/bitops.h>
> +#include <linux/seq_file.h>
>
>  #define EP93XX_GPIO_F_INT_STATUS 0x5c
>  #define EP93XX_GPIO_A_INT_STATUS 0xa0
> @@ -40,7 +41,6 @@
>  #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;
> @@ -185,6 +185,7 @@ static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
>         ep93xx_gpio_update_int_params(epg, eic);
>
>         writeb(port_mask, epg->base + eic->irq_offset + EP93XX_INT_EOI_OFFSET);
> +       gpiochip_disable_irq(gc, irqd_to_hwirq(d));
>  }
>
>  static void ep93xx_gpio_irq_mask(struct irq_data *d)
> @@ -195,6 +196,7 @@ static void ep93xx_gpio_irq_mask(struct irq_data *d)
>
>         eic->int_unmasked &= ~BIT(d->irq & 7);
>         ep93xx_gpio_update_int_params(epg, eic);
> +       gpiochip_disable_irq(gc, irqd_to_hwirq(d));
>  }
>
>  static void ep93xx_gpio_irq_unmask(struct irq_data *d)
> @@ -203,6 +205,7 @@ static void ep93xx_gpio_irq_unmask(struct irq_data *d)
>         struct ep93xx_gpio_irq_chip *eic = to_ep93xx_gpio_irq_chip(gc);
>         struct ep93xx_gpio *epg = gpiochip_get_data(gc);
>
> +       gpiochip_enable_irq(gc, irqd_to_hwirq(d));
>         eic->int_unmasked |= BIT(d->irq & 7);
>         ep93xx_gpio_update_int_params(epg, eic);
>  }
> @@ -320,15 +323,25 @@ static int ep93xx_gpio_set_config(struct gpio_chip *gc, unsigned offset,
>         return 0;
>  }
>
> -static void ep93xx_init_irq_chip(struct device *dev, struct irq_chip *ic)
> +static void ep93xx_irq_print_chip(struct irq_data *data, struct seq_file *p)
>  {
> -       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;
> +       struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
> +
> +       seq_printf(p, dev_name(gc->parent));
>  }
>
> +static const struct irq_chip gpio_eic_irq_chip = {
> +       .name                   = "ep93xx-gpio-eic",
> +       .irq_ack                = ep93xx_gpio_irq_ack,
> +       .irq_mask               = ep93xx_gpio_irq_mask,
> +       .irq_unmask             = ep93xx_gpio_irq_unmask,
> +       .irq_mask_ack   = ep93xx_gpio_irq_mask_ack,
> +       .irq_set_type   = ep93xx_gpio_irq_type,
> +       .irq_print_chip = ep93xx_irq_print_chip,
> +       .flags                  = IRQCHIP_IMMUTABLE,
> +       GPIOCHIP_IRQ_RESOURCE_HELPERS,
> +};
> +
>  static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>                                 struct platform_device *pdev,
>                                 struct ep93xx_gpio *epg,
> @@ -359,12 +372,7 @@ static int ep93xx_gpio_add_bank(struct ep93xx_gpio_chip *egc,
>                 if (!egc->eic)
>                         return -ENOMEM;
>                 egc->eic->irq_offset = bank->irq;
> -               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;
> +               gpio_irq_chip_set_chip(girq, &gpio_eic_irq_chip);
>         }
>
>         if (bank->has_irq) {
> --
> 2.37.4
>

Queued for fixes, thanks!

Bart