iio: adc: Add support for STM32 ADC

This patch adds support for STMicroelectronics STM32 MCU's analog to
digital converter.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/adc/Kconfig

@@ -453,6 +453,16 @@ config STM32_ADC_CORE
 	  This driver can also be built as a module.  If so, the module
 	  will be called stm32-adc-core.
 
+config STM32_ADC
+	tristate "STMicroelectronics STM32 adc"
+	depends on STM32_ADC_CORE
+	help
+	  Say yes here to build support for STMicroelectronics stm32 Analog
+	  to Digital Converter (ADC).
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called stm32-adc.
+
 config STX104
 	tristate "Apex Embedded Systems STX104 driver"
 	depends on X86 && ISA_BUS_API

drivers/iio/adc/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
 obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
 obj-$(CONFIG_STX104) += stx104.o
 obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
+obj-$(CONFIG_STM32_ADC) += stm32-adc.o
 obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
 obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
 obj-$(CONFIG_TI_ADC12138) += ti-adc12138.o