linux-kernel - Re: [PATCH 23/23] Documentation: gpio: add documentation for gpio-mockup

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Message-ID: <20200907115310.GA1891694@smile.fi.intel.com>
Date:   Mon, 7 Sep 2020 14:53:10 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 23/23] Documentation: gpio: add documentation for
 gpio-mockup

On Mon, Sep 07, 2020 at 12:26:34PM +0200, Bartosz Golaszewski wrote:
> On Mon, Sep 7, 2020 at 11:59 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > On Fri, Sep 04, 2020 at 08:15:59PM -0700, Randy Dunlap wrote:
> > > On 9/4/20 8:45 AM, Bartosz Golaszewski wrote:
> >
> > ...
> >
> > > > +GPIO Testing Driver
> > > > +===================
> > > > +
> > > > +The GPIO Testing Driver (gpio-mockup) provides a way to create simulated GPIO
> > > > +chips for testing purposes. There are two ways of configuring the chips exposed
> > > > +by the module. The lines can be accessed using the standard GPIO character
> > > > +device interface as well as manipulated using the dedicated debugfs directory
> > > > +structure.
> > >
> > > Could configfs be used for this instead of debugfs?
> > > debugfs is ad hoc.
> >
> > Actually sounds like a good idea.
> >
> 
> Well, then we can go on and write an entirely new mockup driver
> (ditching module params and dropping any backwards compatibility)
> because we're already using debugfs for line values.
> 
> How would we pass the device properties to configfs created GPIO chips
> anyway? Devices seem to only be created using mkdir. Am I missing
> something?

Same way how USB composite works, no?

-- 
With Best Regards,
Andy Shevchenko