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From: Andy Shevchenko <andy.shevchenko@gmail.com>
Date: Sat, 6 May 2017 17:21:43 +0300
Message-ID: <CAHp75VdPd_5tBCggknRFkirGN1Z5h0LLoq-DazuHwxcY-=AjHQ@mail.gmail.com>
Subject: Re: [PATCH 00/10] fujitsu-laptop: use device-specific data instead of
 module-wide globals
To: =?UTF-8?B?TWljaGHFgiBLxJlwaWXFhA==?= <kernel@kempniu.pl>
Cc: Darren Hart <dvhart@infradead.org>,
        Jonathan Woithe <jwoithe@just42.net>,
        Rafael Wysocki <rjw@rjwysocki.net>,
        Andy Shevchenko <andy@infradead.org>,
        Platform Driver <platform-driver-x86@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Sat, May 6, 2017 at 3:45 PM, Michał Kępień <kernel@kempniu.pl> wrote:

> To be fair, one thing that may be "unnatural" with this approach is that
> even though fujitsu-backlight would depend on fujitsu-laptop, it would
> still have to get a handle to FUJ02E3 using:
>
>     acpi_get_handle(NULL, "\\_SB.FEXT", ...)
>
> because call_fext_func() - and thus fext_backlight() - needs to be
> passed a handle to FUJ02E3 and the two ACPI devices (FUJ02B1 handled by
> fujitsu-backlight and FUJ02E3 handled by fujitsu-laptop) are not related
> from the perspective of the ACPI device hierarchy.  Unless there is a
> better way of implementing this, in which case I am open to suggestions.

There are two areas to check with:
1. Remote graph node
https://lwn.net/Articles/718184/
2. Component framework (only works in case when all devices are
mandatory to have).

-- 
With Best Regards,
Andy Shevchenko