boards/arm/disco_l475_iot1/disco_l475_iot1_defconfig

CONFIG_ARM=y
CONFIG_BOARD_DISCO_L475_IOT1=y
CONFIG_SOC_SERIES_STM32L4X=y
CONFIG_SOC_STM32L475XG=y
CONFIG_CORTEX_M_SYSTICK=y
CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000

# enable uart driver
CONFIG_SERIAL=y

# enable pinmux
CONFIG_PINMUX=y

# enable GPIO
CONFIG_GPIO=y

# clock configuration
CONFIG_CLOCK_CONTROL=y

# SYSCLK selection

# Default: PLL driven by HSI
CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL=y
CONFIG_CLOCK_STM32_PLL_SRC_HSI=y
# Alternative for BLE use cases: Direct MSI
#CONFIG_CLOCK_STM32_SYSCLK_SRC_MSI=y

# Configure bus clocks
CONFIG_CLOCK_STM32_AHB_PRESCALER=1
CONFIG_CLOCK_STM32_APB1_PRESCALER=1
CONFIG_CLOCK_STM32_APB2_PRESCALER=1

# console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y

# enable PWM
CONFIG_PWM=y

# enable MPU
CONFIG_STM32_ARM_MPU_ENABLE=y

# enable I2C
CONFIG_I2C=y

# enable SPI
CONFIG_SPI=y

CONFIG_BT_SPI=y
CONFIG_BT_SPI_BLUENRG=y

# sensors configuration
CONFIG_LIS3MDL_TRIGGER_NONE=y
CONFIG_HTS221_TRIGGER_NONE=y