ARM: vexpress: refine dependencies for new code

The versatile express changes for 3.16 introduced a number of
build regressions for randconfig kernels by not tracking dependencies
between the components right.

This patch tries to rectify that:

* the mach-vexpress code cannot link without the syscfg driver,
  which in turn needs MFD_VEXPRESS_SYSREG
* various drivers call devm_regmap_init_vexpress_config(), which
  has to be exported so it can be used by loadable modules
* the configuration bus uses OF DT helper functions that are not
  available to platforms disable CONFIG_OF
* The sysreg driver exports GPIOs through gpiolib, which can
  be disabled on some platforms.
* The clocksource code cannot be built on platforms that don't
  use modern timekeeping but rely on gettimeoffset.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
index 657d52d0391f..b8ac752fd24b 100644
--- a/arch/arm/mach-vexpress/Kconfig
+++ b/arch/arm/mach-vexpress/Kconfig
@@ -18,6 +18,8 @@ config ARCH_VEXPRESS
         select POWER_SUPPLY
         select REGULATOR_FIXED_VOLTAGE if REGULATOR
         select VEXPRESS_CONFIG
+        select VEXPRESS_SYSCFG
+        select MFD_VEXPRESS_SYSREG
         help
           This option enables support for systems using Cortex processor based
           ARM core and logic (FPGA) tiles on the Versatile Express motherboard,