Building with the attached random configuration file,

warning: (INTEL_SOC_DTS_IOSF_CORE && PUNIT_ATOM_DEBUG) selects
IOSF_MBI which has unmet direct dependencies (PCI)
warning: (SND_SOC_INTEL_BYTCR_RT5640_MACH &&
SND_SOC_INTEL_CHT_BSW_RT5672_MACH && SND_SOC_INTEL_CHT_BSW_RT5645_MACH
&& SND_SOC_INTEL_CHT_BSW_MAX98090_TI_MACH) selects SND_SST_IPC_ACPI
which has unmet direct dependencies (SOUND && !M68K && !UML && SND &&
SND_SOC && ACPI)

drivers/tty/serial/mxs-auart.o: In function `mctrl_gpio_enable_ms':
mxs-auart.c:(.text+0x15c0): multiple definition of `mctrl_gpio_enable_ms'
drivers/tty/serial/atmel_serial.o:atmel_serial.c:(.text+0x29b0): first
defined here
drivers/tty/serial/mxs-auart.o: In function `mctrl_gpio_disable_ms':
mxs-auart.c:(.text+0x15d0): multiple definition of `mctrl_gpio_disable_ms'
drivers/tty/serial/atmel_serial.o:atmel_serial.c:(.text+0x29c0): first
defined here

-- 
Jim