linux-kernel - Re: [PATCH v11 2/6] gpiolib: allow to specify the firmware node in struct gpio

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Date:   Wed, 1 Dec 2021 15:36:29 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Kent Gibson <warthog618@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.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 v11 2/6] gpiolib: allow to specify the firmware node in
 struct gpio_chip

On Wed, Dec 1, 2021 at 3:34 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Wed, Dec 01, 2021 at 04:28:19PM +0200, Andy Shevchenko wrote:
> > On Wed, Dec 01, 2021 at 02:53:42PM +0100, Bartosz Golaszewski wrote:
> > > On Wed, Dec 1, 2021 at 2:40 PM Andy Shevchenko
> > > <andriy.shevchenko@...ux.intel.com> wrote:
> > > > On Wed, Dec 01, 2021 at 02:11:28PM +0100, Bartosz Golaszewski wrote:
> > > > > On Tue, Nov 30, 2021 at 10:04 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > ...
> >
> > > > > Let me maybe rephrase the problem: currently, for GPIO devices
> > > > > instantiating multiple banks created outside of the OF or ACPI
> > > > > frameworks (e.g. instantiated manually and configured using a
> > > > > hierarchy of software nodes with a single parent swnode and a number
> > > > > of child swnodes representing the children), it is impossible to
> > > > > assign firmware nodes other than the one representing the top GPIO
> > > > > device to the gpiochip child devices.
> > > > >
> > > > > In fact if we want to drop the OF APIs entirely from gpiolib - this
> > > > > would be the right first step as for gpio-sim it actually replaces the
> > > > > gc->of_node = some_of_node; assignment that OF-based drivers do for
> > > > > sub-nodes defining banks and it does work with device-tree (I verified
> > > > > that too) thanks to the fwnode abstraction layer.
> > > >
> > > > I still don't see how you set up hierarchy of primary/secondary fwnodes.
> > > >
> > > > And I don't like this change. It seems it band-aids some issue with fwnode
> > > > usage. What the easiest way to reproduce the issue with your series applied
> > > > (without this change)?
> > >
> > > Drop this patch and drop the line where the fwnode is assigned in
> > > gpio-sim.c. Then probe the device and print the addresses of the
> > > parent and child swnodes. See how they are the same and don't match
> > > the swnode hierarchy we created. You can then apply this patch and see
> > > how it becomes correct.
> >
> > Thanks. I will give a spin.
> >
> > Note, it seems I have to revert your older code first...
>
> Okay, I have to postpone because simple revert doesn't work for me.
> Can you clean up the next, please and I can use it starting from tomorrow?
>
>
> $ git tag --contains 5065e08e4ef3
> DONT-USE-next-20211105
> next-20211101
> next-20211102
> next-20211103
> next-20211104
> next-20211105
> next-20211106
> next-20211108
> next-20211109
> next-20211110
> next-20211111
> next-20211112
> next-20211115
> next-20211116
> next-20211117
> next-20211118
> next-20211123
> next-20211124
> next-20211125
> next-20211126
> next-20211129
> next-20211130
> next-20211201
>
> --
> With Best Regards,
> Andy Shevchenko
>
>

None of this is in next, please use:
https://github.com/brgl/linux/tree/topic/gpio-sim-v12 if you want a
branch.

I just thought you were going to simply apply these patches.

Bart