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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Fri, 5 Jun 2020 19:04:45 +0300
Message-ID: <CAHp75VduUG=XkvyZwdZDNqBh3KE67MWZWgqBN67fN6StAa469w@mail.gmail.com>
Subject: Re: [PATCH v4 04/11] watchdog: add support for sl28cpld watchdog
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Michael Walle <michael@walle.cc>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org,
        linux-watchdog@vger.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>,
        Jean Delvare <jdelvare@suse.com>,
        Lee Jones <lee.jones@linaro.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <maz@kernel.org>, Mark Brown <broonie@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On Fri, Jun 5, 2020 at 6:05 PM Guenter Roeck <linux@roeck-us.net> wrote:
> On Fri, Jun 05, 2020 at 05:09:11PM +0300, Andy Shevchenko wrote:
> > On Fri, Jun 05, 2020 at 06:52:00AM -0700, Guenter Roeck wrote:
> > > On 6/5/20 3:50 AM, Andy Shevchenko wrote:
> > > > On Fri, Jun 5, 2020 at 1:24 PM Michael Walle <michael@walle.cc> wrote:
> > > >> Am 2020-06-05 10:14, schrieb Andy Shevchenko:
> > > >>> On Fri, Jun 5, 2020 at 12:14 AM Michael Walle <michael@walle.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.
> >
> > Latter according to Greg KH. One of the (plenty) examples [1].
> >
> > [1]: https://www.mail-archive.com/driverdev-devel@linuxdriverproject.org/msg96495.html
> >
> What is the suggested replacement ?

In some mails he suggested to use sysfs.

-- 
With Best Regards,
Andy Shevchenko