linux-kernel - Re: watchdog: davinci_wdt: add possibility to configure watchdog period

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Date:   Mon, 16 Jul 2018 07:12:27 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Michele Dionisio <michele.dionisio@...il.com>
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Michele Dionisio <michele.dionisio@...ersoft.com>
Subject: Re: watchdog: davinci_wdt: add possibility to configure watchdog
 period

On 07/16/2018 07:04 AM, Michele Dionisio wrote:
> I have done what are already done in:
> omap_wdt.c with parameter timer_margin
> softdog.c with parameter softMargin
> ...
> 
> the same feature is missing in davinci_wdt and I think is quite usefull.
> 
> if you NACK because I don't use watchdog_init_timeout I can rewrite
> the code but I do that to reduce the number of changes done in one
> commit

Did you read my comment ? Did you try to use the existing "heartbeat"
module parameter ?

If that doesn't work for some reason, lets fix it. Introducing another
module parameter with a different name because the first one doesn't work
simply does not make sense.

Guenter

> Il giorno lun 16 lug 2018 alle ore 15:31 Guenter Roeck
> <linux@...ck-us.net> ha scritto:
>>
>> On 07/16/2018 05:19 AM, michele.dionisio@...il.com wrote:
>>> From: Michele Dionisio <michele.dionisio@...ersoft.com>
>>>
>>> It is not possible to implement setting of watchdog period because it is
>>> not possible to stop watchdog so it is nice to have possibility to
>>> configure watchdog period at module loading.
>>>
>>> Signed-off-by: Michele Dionisio <michele.dionisio@...il.com>
>>>
>>> diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
>>> index 6c6594261cb7..5f95afa20fee 100644
>>> --- a/drivers/watchdog/davinci_wdt.c
>>> +++ b/drivers/watchdog/davinci_wdt.c
>>> @@ -54,6 +54,10 @@
>>>    #define WDKEY_SEQ0          (0xa5c6 << 16)
>>>    #define WDKEY_SEQ1          (0xda7e << 16)
>>>
>>> +static unsigned int init_timeout;
>>> +module_param(init_timeout, uint, 0);
>>> +MODULE_PARM_DESC(init_timeout, "initial watchdog timeout (in seconds)");
>>> +
>>>    static int heartbeat;
>>>
>>>    /*
>>> @@ -223,8 +227,10 @@ static int davinci_wdt_probe(struct platform_device *pdev)
>>>        wdd->ops                = &davinci_wdt_ops;
>>>        wdd->min_timeout        = 1;
>>>        wdd->max_timeout        = MAX_HEARTBEAT;
>>> -     wdd->timeout            = DEFAULT_HEARTBEAT;
>>> -     wdd->parent             = &pdev->dev;
>>> +     if ((init_timeout >= 1) && (init_timeout <= MAX_HEARTBEAT))
>>> +             wdd->timeout = init_timeout;
>>> +     else
>>> +             wdd->timeout = DEFAULT_HEARTBEAT;
>>>
>>>        watchdog_init_timeout(wdd, heartbeat, dev);
>>>
>>
>> NACK. This is done with the 'heartbeat' module parameter already.
>>
>> Guenter
>>
>>
>