Using input prescaler, capture unit will trigger DMA once every
configurable /2, /4 or /8 events (rising edge). This helps improve
period (only) capture accuracy at high rates.
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org>
Acked-by: NThierry Reding <thierry.reding@gmail.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>