iio: adc: stm32: add support for lptimer triggers
STM32 ADC supports hardware triggers like STM32 Low-Power Timer. For instance, STM32H7 ADC may be triggered by instances 1, 2 or 3. Add hardware triggered mode so Low-Power Timer Trigger driver can validate device. Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Acked-by: NJonathan Cameron <jic23@kernel.org> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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