arm64: select ARCH_WANT_OPTIONAL_GPIOLIB

An architecture should not unconditionally enable 'GENERIC_GPIO'
without providing an implementation. In case of arm64, selecting
ARCH_WANT_OPTIONAL_GPIOLIB is the right solution, because it
lets us enable GPIOLIB when configuring the kernel, and that
implicitly turns on GENERIC_GPIO.

Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f8f362aafee9..e9a8fe607918 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1,6 +1,7 @@
 config ARM64
         def_bool y
         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+        select ARCH_WANT_OPTIONAL_GPIOLIB
         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
         select ARM_AMBA
         select CLONE_BACKWARDS
@@ -92,7 +93,7 @@ config IOMMU_HELPER
         def_bool SWIOTLB
 
 config GENERIC_GPIO
-        def_bool y
+        bool
 
 source "init/Kconfig"