arm64 defconfig breakage (gpio) in next-20130218

[Catalin Marinas]

On Thu, Feb 21, 2013 at 10:02:15AM +0000, Arnd Bergmann wrote:
> On Thursday 21 February 2013 17:31:07 Shawn Guo wrote:
> > > 
> > > I've bisected this down to 0fa2fd9a0d: "Merge branch 'linusw/devel' of
> > > git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git into
> > > gpio/next". Both parent commits build fine.
> > > 
> > > I've played around a bit, and selecting ARCH_REQUIRE_GPIOLIB in the arm64
> > > Kconfig fixes the issue, but I'm unfamilar with gpio{,lib} and I'm not sure
> > > that's the best/correct way of solving this.
> > 
> > Kconfig GENERIC_GPIO is designed as an option defined at architecture
> > level and select by platform who knows how gpio driver/API is
> > implemented.  The following change should fix the error.
> > 
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index f532ce5..aca4a25 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -93,7 +93,7 @@ config IOMMU_HELPER
> >         def_bool SWIOTLB
> > 
> >  config GENERIC_GPIO
> > -       def_bool y
> > +       bool
> > 
> >  source "init/Kconfig"
> 
> But we have no arm64 platforms that would pick GENERIC_GPIO, it's expected
> to come from GPIOLIB anyway. I think the right fix is this:
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index ab4aa54..3fab0db 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -3,6 +3,7 @@ config ARM64
>  	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>  	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
>  	select ARCH_WANT_FRAME_POINTERS
> +	select ARCH_WANT_OPTIONAL_GPIOLIB
>  	select ARM_AMBA
>  	select ARM_ARCH_TIMER
>  	select CLONE_BACKWARDS
> @@ -92,9 +93,6 @@ config SWIOTLB
>  config IOMMU_HELPER
>  	def_bool SWIOTLB
>  
> -config GENERIC_GPIO
> -	def_bool y
> -

In my soc-armv8-model branch, the ARCH_VEXPRESS selects
ARCH_REQUIRE_GPIOLIB which in turn selects GENERIC_GPIO but this seems
to be defined in the arch Kconfig.

-- 
Catalin