dt-bindings: stm32: serial: Add optional reset

STM32 serial can be reset via reset controller.
Add an optional reset property to stm32 usart bindings.

Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Erwan Le Ray 2019-05-24 17:30:38 +02:00 • committed by Rob Herring
commit 1419f64ef5