linux-kernel - [PATCH] gpiolib: enable CONFIG_GPIOLIB

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Message-Id: <20250726211053.2226857-1-arnd@kernel.org>
Date: Sat, 26 Jul 2025 23:10:43 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Arnd Bergmann <arnd@...db.de>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc: kernel test robot <lkp@...el.com>,
	Peng Fan <peng.fan@....com>,
	Koichiro Den <koichiro.den@...onical.com>,
	Lee Jones <lee@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	André Draszik <andre.draszik@...aro.org>,
	Nikolaos Pasaloukos <nikolaos.pasaloukos@...ize.com>,
	Thomas Richard <thomas.richard@...tlin.com>,
	Yixun Lan <dlan@...too.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] gpiolib: enable CONFIG_GPIOLIB_LEGACY even for !GPIOLIB

From: Arnd Bergmann <arnd@...db.de>

A few drivers that use the legacy GPIOLIB interfaces can be enabled
even when GPIOLIB is disabled entirely. With my previous patch this
now causes build failures like:

   drivers/nfc/s3fwrn5/uart.c: In function 's3fwrn82_uart_parse_dt':
        drivers/nfc/s3fwrn5/uart.c:100:14: error: implicit declaration of function 'gpio_is_valid'; did you mean 'uuid_is_valid'? [-Werror=implicit-function-declaration]

These did not show up in my randconfig tests because randconfig almost
always has GPIOLIB selected by some other driver, and I did most
of the testing with follow-up patches that address the failures
properly.

Move the symbol outside of the 'if CONFIG_GPIOLIB' block for the moment
to avoid the build failures. It can be moved back and turned off by
default once all the driver specific changes are merged.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202507261934.yIHeUuEQ-lkp@intel.com/
Fixes: 678bae2eaa81 ("gpiolib: make legacy interfaces optional")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpio/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8bda3c9d47b4..c48f9badb513 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -12,11 +12,11 @@ menuconfig GPIOLIB
 
 	  If unsure, say N.
 
-if GPIOLIB
-
 config GPIOLIB_LEGACY
 	def_bool y
 
+if GPIOLIB
+
 config GPIOLIB_FASTPATH_LIMIT
 	int "Maximum number of GPIOs for fast path"
 	range 32 512
-- 
2.39.5