On Thu, Jun 13, 2019 at 03:49:52PM +0200, Erwan Le Ray wrote: > From: Bich Hemon <bich.hemon@xxxxxx> > > Add options for pinctrl states: > - "sleep" for low power > - "idle" for low power and wakeup capabilities enabled > - "no_console_suspend" for enabling console messages in low power > > Signed-off-by: Bich Hemon <bich.hemon@xxxxxx> > Signed-off-by: Erwan Le Ray <erwan.leray@xxxxxx> > > diff --git a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt > index 5ec80c1..64a5ea9 100644 > --- a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt > +++ b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt > @@ -13,7 +13,14 @@ Required properties: > - clocks: The input clock of the USART instance > > Optional properties: > -- pinctrl: The reference on the pins configuration > +- pinctrl-names: Set to "default". An additional "sleep" state can be defined > + to set pins in sleep state when in low power. In case the device is used as > + a wakeup source, "idle" state is defined in order to keep RX pin active. > + For a console device, an optional state "no_console_suspend" can be defined > + to enable console messages during suspend. Typically, "no_console_suspend" and > + "default" states can refer to the same pin configuration. no_console_suspend is a linux thing and doesn't belong in DT. Rob
