linux-kernel - Re: [PATCH 1/9] gpio: rda: Convert to immutable irq

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Message-ID: <20230320103452.GD4564@thinkpad>
Date:   Mon, 20 Mar 2023 16:04:52 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-gpio@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>,
        Thorsten Scherer <t.scherer@...elmann.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Robert Richter <rric@...nel.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-unisoc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 1/9] gpio: rda: Convert to immutable irq_chip

On Mon, Mar 20, 2023 at 10:55:08AM +0100, Linus Walleij wrote:
> Convert the driver to immutable irq-chip with a bit of
> intuition.
> 
> Cc: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Acked-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
>  drivers/gpio/gpio-rda.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-rda.c b/drivers/gpio/gpio-rda.c
> index 62ba18b3a602..dd568907d389 100644
> --- a/drivers/gpio/gpio-rda.c
> +++ b/drivers/gpio/gpio-rda.c
> @@ -38,7 +38,6 @@ struct rda_gpio {
>  	struct gpio_chip chip;
>  	void __iomem *base;
>  	spinlock_t lock;
> -	struct irq_chip irq_chip;
>  	int irq;
>  };
>  
> @@ -74,6 +73,7 @@ static void rda_gpio_irq_mask(struct irq_data *data)
>  	value |= BIT(offset) << RDA_GPIO_IRQ_FALL_SHIFT;
>  
>  	writel_relaxed(value, base + RDA_GPIO_INT_CTRL_CLR);
> +	gpiochip_disable_irq(chip, offset);
>  }
>  
>  static void rda_gpio_irq_ack(struct irq_data *data)
> @@ -154,6 +154,7 @@ static void rda_gpio_irq_unmask(struct irq_data *data)
>  	u32 offset = irqd_to_hwirq(data);
>  	u32 trigger = irqd_get_trigger_type(data);
>  
> +	gpiochip_enable_irq(chip, offset);
>  	rda_gpio_set_irq(chip, offset, trigger);
>  }
>  
> @@ -195,6 +196,16 @@ static void rda_gpio_irq_handler(struct irq_desc *desc)
>  	chained_irq_exit(ic, desc);
>  }
>  
> +static const struct irq_chip rda_gpio_irq_chip = {
> +	.name = "rda-gpio",
> +	.irq_ack = rda_gpio_irq_ack,
> +	.irq_mask = rda_gpio_irq_mask,
> +	.irq_unmask = rda_gpio_irq_unmask,
> +	.irq_set_type = rda_gpio_irq_set_type,
> +	.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
> +	GPIOCHIP_IRQ_RESOURCE_HELPERS,
> +};
> +
>  static int rda_gpio_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -241,15 +252,8 @@ static int rda_gpio_probe(struct platform_device *pdev)
>  	rda_gpio->chip.base = -1;
>  
>  	if (rda_gpio->irq >= 0) {
> -		rda_gpio->irq_chip.name = "rda-gpio",
> -		rda_gpio->irq_chip.irq_ack = rda_gpio_irq_ack,
> -		rda_gpio->irq_chip.irq_mask = rda_gpio_irq_mask,
> -		rda_gpio->irq_chip.irq_unmask = rda_gpio_irq_unmask,
> -		rda_gpio->irq_chip.irq_set_type = rda_gpio_irq_set_type,
> -		rda_gpio->irq_chip.flags = IRQCHIP_SKIP_SET_WAKE,
> -
>  		girq = &rda_gpio->chip.irq;
> -		girq->chip = &rda_gpio->irq_chip;
> +		gpio_irq_chip_set_chip(girq, &rda_gpio_irq_chip);
>  		girq->handler = handle_bad_irq;
>  		girq->default_type = IRQ_TYPE_NONE;
>  		girq->parent_handler = rda_gpio_irq_handler;
> 
> -- 
> 2.34.1
> 

-- 
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