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* iio: adc: stm32: add trigger polarity extended attributeFabrice Gasnier2017-01-281-0/+18
Define extended attribute so that user may choose rising, falling or both edges for external trigger sources. Default to rising edge in case it isn't set. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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