linux-kernel - Re: [PATCH 21/21] gpiolib: turn off legacy interface by default

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Message-Id: <c7d66744-29c9-4f70-905f-7ef133a22422@app.fastmail.com>
Date: Sat, 09 Aug 2025 21:47:31 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
 "Arnd Bergmann" <arnd@...nel.org>
Cc: "Bartosz Golaszewski" <brgl@...ev.pl>,
 "Linus Walleij" <linus.walleij@...aro.org>,
 "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
 "Peng Fan" <peng.fan@....com>,
 "Geert Uytterhoeven" <geert+renesas@...der.be>,
 "Koichiro Den" <koichiro.den@...onical.com>,
 André Draszik <andre.draszik@...aro.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 21/21] gpiolib: turn off legacy interface by default

On Sat, Aug 9, 2025, at 12:18, Andy Shevchenko wrote:
> On Fri, Aug 08, 2025 at 05:18:06PM +0200, Arnd Bergmann wrote:
>
>> All users of the legacy interface now select CONFIG_GPIOLIB_LEGACY,
>> so it can be turned off by default.
>> 
>> Allow turning it on manually for compile testing, in order to keep
>> the build coverage of the legacy drivers.
>
>>  config GPIOLIB_LEGACY
>> -	def_bool y
>> +	bool "Legacy GPIO interfaces" if COMPILE_TEST
>
> Maybe I'm missing something, but how does it supposed to be compiled for old
> platforms? (No, COMPILE_TEST is not a correct option for that)
> Perhaps you meant EXPERT ?

The COMPILE_TEST is really just meant for enabling some drivers
that would otherwise be skipped in allmodconfig builds.

All the old platforms that use one of the GPIOLIB_LEGACY drivers
select that symbol once the first six patches are merged.

    Arnd