STM32 Low-Power Timer supports generic 3 cells PWM to encode PWM number,
period and polarity.
Signed-off-by: NGerald Baeza <gerald.baeza@st.com>
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>