linux-kernel - Re: [PATCH v4 04/11] watchdog: add support for sl28cpld watchdog

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Message-ID: <871a4990-5b94-3a17-01d4-74998375f08b@roeck-us.net>
Date:   Fri, 5 Jun 2020 06:52:00 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Michael Walle <michael@...le.cc>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hwmon@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v4 04/11] watchdog: add support for sl28cpld watchdog

On 6/5/20 3:50 AM, Andy Shevchenko wrote:
> On Fri, Jun 5, 2020 at 1:24 PM Michael Walle <michael@...le.cc> wrote:
>> Am 2020-06-05 10:14, schrieb Andy Shevchenko:
>>> On Fri, Jun 5, 2020 at 12:14 AM Michael Walle <michael@...le.cc> wrote:
> 
> ...
> 
>>>> +static bool nowayout = WATCHDOG_NOWAYOUT;
>>>> +module_param(nowayout, bool, 0);
>>>> +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started
>>>> (default="
>>>> +                               __MODULE_STRING(WATCHDOG_NOWAYOUT)
>>>> ")");
>>>> +
>>>> +static int timeout;
>>>> +module_param(timeout, int, 0);
>>>> +MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
>>>
>>> Guenter ACKed this, but I'm wondering why we still need module
>>> parameters...
>>
>> How would a user change the nowayout or the timeout? For the latter
>> there is
>> a device tree entry, but thats not easy changable by the user.
> 
> Yes, it's more question to VIm and Guenter than to you.
> 

Has support for providing module parameters with the kernel command line
been discontinued/deprecated, or did it run out of favor ? Sorry if I
missed that.

nowayout has a configuration default. A module parameter is sometimes
provided by drivers to be able to override it. The timeout provided
via devicetree or on the command line is only the initial/default
timeout, and the watchdog daemon can change it after opening the
watchdog device as it sees fit.

Guenter