From: Arnd Bergmann <arnd@arndb.de>

The regmap drivers need to be selected by each user, without that there
can be configurations that fail to link:

x86_64-linux-ld: drivers/gpio/gpio-qixis-fpga.o: in function `qixis_cpld_gpio_probe':
gpio-qixis-fpga.c:(.text+0x13a): undefined reference to `__devm_regmap_init_mmio_clk'

Fixes: e88500247dc3 ("gpio: add QIXIS FPGA GPIO controller")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpio/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 93ab737c6adb..a1fd130a2408 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1568,6 +1568,7 @@ config GPIO_QIXIS_FPGA
 	tristate "NXP QIXIS FPGA GPIO support"
 	depends on MFD_SIMPLE_MFD_I2C || COMPILE_TEST
 	select GPIO_REGMAP
+	select REGMAP_MMIO
 	help
 	  This enables support for the GPIOs found in the QIXIS FPGA which is
 	  integrated on some NXP Layerscape boards such as LX2160ARDB and
-- 
2.39.5

On Thu, 04 Dec 2025 10:48:47 +0100, Arnd Bergmann wrote:
> The regmap drivers need to be selected by each user, without that there
> can be configurations that fail to link:
> 
> x86_64-linux-ld: drivers/gpio/gpio-qixis-fpga.o: in function `qixis_cpld_gpio_probe':
> gpio-qixis-fpga.c:(.text+0x13a): undefined reference to `__devm_regmap_init_mmio_clk'
> 
> 
> [...]

Applied, thanks!

[1/1] gpio: qixis: select CONFIG_REGMAP_MMIO
      https://git.kernel.org/brgl/linux/c/db9c67bfca8585bb7f00f289056e7b83502861c8

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>