iio: trigger: stm32-timer: add enable attribute
In order to use encoder mode, timers needs to be enabled (e.g. CEN bit) along with peripheral clock. Add IIO_CHAN_INFO_ENABLE attribute to handle this. Also, in triggered mode, CEN bit is set automatically in hardware. Then clock must be enabled before starting triggered mode. Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Acked-by: NBenjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
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