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iio: adc: stm32: add support for triggered buffer mode
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STM32 ADC conversions can be launched using hardware triggers.
It can be used to start conversion sequences (group of channels).
Selected channels are select via sequence registers.
Trigger source is selected via 'extsel' (external trigger mux).
Trigger polarity is set to rising edge by default.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Fabrice Gasnier authored and Jonathan Cameron committed Jan 28, 2017
1 parent 6db0f7c commit da9b948
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2 changes: 2 additions & 0 deletions drivers/iio/adc/Kconfig
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Expand Up @@ -499,6 +499,8 @@ config STM32_ADC_CORE
depends on ARCH_STM32 || COMPILE_TEST
depends on OF
depends on REGULATOR
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
Select this option to enable the core driver for STMicroelectronics
STM32 analog-to-digital converter (ADC).
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