linux-kernel - Re: [PATCH v2] watchdog: s3c2410: Use platform_get

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Message-ID: <fc705702-8a8b-d2aa-7de6-7c409c091365@roeck-us.net>
Date:   Thu, 16 Dec 2021 16:26:06 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2] watchdog: s3c2410: Use platform_get_irq() to get the
 interrupt

On 12/16/21 1:47 PM, Lad Prabhakar wrote:
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypassed the hierarchical setup and messed up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq().
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> v1->v2
> * Dropped goto and directly returned on error
> ---
>   drivers/watchdog/s3c2410_wdt.c | 15 ++++++---------
>   1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> index 2395f353e52d..d92bc1c24182 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -513,9 +513,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct s3c2410_wdt *wdt;
> -	struct resource *wdt_irq;
>   	unsigned int wtcon;
>   	int started = 0;
> +	int wdt_irq;
>   	int ret;
>   
>   	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
> @@ -536,12 +536,9 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   		}
>   	}
>   
> -	wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -	if (wdt_irq == NULL) {
> -		dev_err(dev, "no irq resource specified\n");
> -		ret = -ENOENT;
> -		goto err;
> -	}
> +	wdt_irq = platform_get_irq(pdev, 0);
> +	if (wdt_irq < 0)
> +		return wdt_irq;
>   
>   	/* get the memory region for the watchdog timer */
>   	wdt->reg_base = devm_platform_ioremap_resource(pdev, 0);
> @@ -592,8 +589,8 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>   			dev_info(dev, "default timer value is out of range, cannot start\n");
>   	}
>   
> -	ret = devm_request_irq(dev, wdt_irq->start, s3c2410wdt_irq, 0,
> -				pdev->name, pdev);
> +	ret = devm_request_irq(dev, wdt_irq, s3c2410wdt_irq, 0,
> +			       pdev->name, pdev);
>   	if (ret != 0) {
>   		dev_err(dev, "failed to install irq (%d)\n", ret);
>   		goto err_cpufreq;
>