dt-bindings: iio: stm32-lptimer-counter: document pinctrl sleep state

Add documentation for optional pinctrl sleep state that can be used by
STM32 LPTimer encoder/counter.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabrice Gasnier 2019-02-25 11:42:46 +01:00 • committed by Jonathan Cameron
commit 74896202df