linux-kernel - Re: [RFT PATCH 11/21] platform: x86: android-tablets: don't access GPIOLIB private members

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Message-ID: <ZP7mWk/jx3FZjMih@smile.fi.intel.com>
Date:   Mon, 11 Sep 2023 13:05:14 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Dipen Patel <dipenp@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Gross <markgross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-tegra@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFT PATCH 11/21] platform: x86: android-tablets: don't access
 GPIOLIB private members

On Sat, Sep 09, 2023 at 04:17:53PM +0200, Hans de Goede wrote:
> On 9/6/23 16:27, Bartosz Golaszewski wrote:
> > On Wed, Sep 6, 2023 at 3:01 PM Hans de Goede <hdegoede@...hat.com> wrote:

...

> > This makes sense! Maybe we'd need a good-old board file setting up all
> > non-described devices using the driver model?
> 
> Right, this is pretty much exactly what the x86-android-tablets
> code does. Except that it does it for a bunch of boards in a single
> .ko / driver. There is a lot of commonality between these boards,
> so this allows sharing most of the code.
> 
> The driver uses DMI matching, with the match's driver_data pointing
> to a description of which devices to instantiate and then the shared
> code takes care of instantiating those.
> 
> About 90% of the data / code is __init or __initdata so both
> the code to instantiate the devices as well as the per board
> data is free-ed after module_init() has run.

...which is nicely looked and isolated hack (or quirk if you prefer)
that I like! Thanks, Hans, for maintaining that!

-- 
With Best Regards,
Andy Shevchenko