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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 30 Sep 2020 19:10:39 +0300
Message-ID: <CAHp75Vdm9K7nGxsk8P_iGy4m=vi=95zpH1S4NuJbb7bekwZoXg@mail.gmail.com>
Subject: Re: How to use an ACPI declared GPIO in a userspace ...
To:     Flavio Suligoi <f.suligoi@asem.it>
Cc:     Bartosz Golaszewski <brgl@bgdev.pl>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Wed, Sep 30, 2020 at 6:54 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> On Wed, Sep 30, 2020 at 6:39 PM Flavio Suligoi <f.suligoi@asem.it> wrote:
> > > I guess you simply didn't get. The "gpio-line-names" property of GPIO
> > > *controller* (provider!) and you are trying to do something with the
> > > *consumer*
> > > if I got it right.
> > >
> > > And of course GPIO line, which has name, has no difference in use from
> > > another
> > > w/o name assigned. You will need to request it by *consumer* either in
> > > kernel
> > > or in user space.
> > >
> > > To be more precise we have to look at your DSDT.
>
> ^^^^^^^ **DSDT**.
>
> > My SSDT table is:
>
> ^^^^ See the difference? I can't help here.

There are two ways to get DSDT:
 1. % cp -a /sys/firmware/acpi/tables /tmp/mytables; tar -cf
mytables.tar /tmp/mytables
 2. % acpidump -o mytables.dat # preferable

> > So I need a "consumer", but I don't want to export the GPIO using its number...
> > If you have any suggestion ...
>
> Define "gpio-line-names" property in the *provider* (controller)
> device node _DSD().


-- 
With Best Regards,
Andy Shevchenko