linux-kernel - Re: [v3, 7/7] watchdog: coh901327: make use of timeout-secs provided in devicetree

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Date:   Sun, 11 Feb 2018 17:11:58 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Wim Van Sebroeck <wim@...ana.be>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Barry Song <baohua@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [v3, 7/7] watchdog: coh901327: make use of timeout-secs provided
 in devicetree

On Sun, Feb 11, 2018 at 09:08:47PM +0100, Marcus Folkesson wrote:
> watchdog_init_timeout() will allways pick timeout_param since it
> defaults to a valid timeout.
> 
> Following best practice described in
> Documentation/watchdog/watchdog-kernel-api.txt to make use of
> the parameter logic.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>

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

> ---
> 
> Notes:
>     v3:
>     	- Reformat and use coh901327_wdt.timeout instead of margin when print out
>     	  timout in probe function.
>     
>     v2:
>     	- Set .timeout in coh901327_wdt structure declaration.
>     	- Set .min_timeout to 1 instead of 0. I could not find a datasheet
>     	  for coh901327, so I'm not sure if 0 is valid. However, 0 seems
>     	  wrong to me and most driver has 1 as min value. If it should
>     	  be 0, please let me know and I have to set another initial
>     	  value for margin.
> 
>  drivers/watchdog/coh901327_wdt.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
> index 4410337f4f7f..500af8a7ec5a 100644
> --- a/drivers/watchdog/coh901327_wdt.c
> +++ b/drivers/watchdog/coh901327_wdt.c
> @@ -67,7 +67,9 @@
>  #define U300_WDOG_IFR_WILL_BARK_IRQ_FORCE_ENABLE			0x0001U
>  
>  /* Default timeout in seconds = 1 minute */
> -static unsigned int margin = 60;
> +#define U300_WDOG_DEFAULT_TIMEOUT					60
> +
> +static unsigned int margin;
>  static int irq;
>  static void __iomem *virtbase;
>  static struct device *parent;
> @@ -235,8 +237,9 @@ static struct watchdog_device coh901327_wdt = {
>  	 * timeout register is max
>  	 * 0x7FFF = 327670ms ~= 327s.
>  	 */
> -	.min_timeout = 0,
> +	.min_timeout = 1,
>  	.max_timeout = 327,
> +	.timeout = U300_WDOG_DEFAULT_TIMEOUT,
>  };
>  
>  static int __exit coh901327_remove(struct platform_device *pdev)
> @@ -315,16 +318,15 @@ static int __init coh901327_probe(struct platform_device *pdev)
>  		goto out_no_irq;
>  	}
>  
> -	ret = watchdog_init_timeout(&coh901327_wdt, margin, dev);
> -	if (ret < 0)
> -		coh901327_wdt.timeout = 60;
> +	watchdog_init_timeout(&coh901327_wdt, margin, dev);
>  
>  	coh901327_wdt.parent = dev;
>  	ret = watchdog_register_device(&coh901327_wdt);
>  	if (ret)
>  		goto out_no_wdog;
>  
> -	dev_info(dev, "initialized. timer margin=%d sec\n", margin);
> +	dev_info(dev, "initialized. (timeout=%d sec)\n",
> +			coh901327_wdt.timeout);
>  	return 0;
>  
>  out_no_wdog: