linux-kernel - Re: [PATCH v12 3/7] gpiolib: of: make fwnode take precedence in struct gpio

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Message-ID: <Yap5ctmlw6NeNM+7@smile.fi.intel.com>
Date:   Fri, 3 Dec 2021 22:09:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v12 3/7] gpiolib: of: make fwnode take precedence in
 struct gpio_chip

On Fri, Dec 03, 2021 at 08:28:34PM +0100, Bartosz Golaszewski wrote:
> On Fri, Dec 3, 2021 at 8:04 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Fri, Dec 03, 2021 at 08:56:27PM +0200, Andy Shevchenko wrote:
> > > On Fri, Dec 03, 2021 at 08:51:56PM +0200, Andy Shevchenko wrote:
> > > > On Fri, Dec 03, 2021 at 02:29:59PM +0100, Bartosz Golaszewski wrote:

...

> > > > >   if (gc->parent)
> > > > >           gdev->dev.of_node = gc->parent->of_node;
> > > > >
> > > > > + if (gc->fwnode)
> > > > > +         gc->of_node = to_of_node(gc->fwnode);
> > > > > +
> > > > >   /* If the gpiochip has an assigned OF node this takes precedence */
> > > > >   if (gc->of_node)
> > > > >           gdev->dev.of_node = gc->of_node;
> > > >
> > > > Similar should be done in acpi_gpio_dev_init():


^^^^^^ (1)

...

> > If we have parent device for several GPIO devices, this won't work right now
> > due to limitations of fwnode regarding to the sturct device.
> >
> > So, it means we may not have shared primary with different secondary fwnodes.
> >
> > So, come back to the initial suggestion (overwrite it for now):
> >
> >         /*
> >          * If custom fwnode provided, use it. Currently we may not
> >          * handle the case where shared primary node has different
> >          * secondary ones. Ideally we have to use
> >          * set_secondary_fwnode() here.
> >          */
> >         if (gc->fwnode)
> >                 device_set_node(&gdev->dev, gc->fwnode);
> >
> 
> Other parts of gpiolib-of depend on the of_node being there.
> Converting it to fwnode is a whole other task so for now I suggest we
> just convert the fwnode to of_node in struct gpio_chip as per my
> patch.

But this is about ACPI counterpart. If you do this, do this in both cases.
Above code for ACPI (1).

-- 
With Best Regards,
Andy Shevchenko