On Thu, Aug 04, 2022 at 04:11:26PM +0000, Roosen Henri wrote: > On Thu, 2022-08-04 at 17:52 +0200, Lukas Wunner wrote: > > On Thu, Aug 04, 2022 at 02:38:23PM +0000, Roosen Henri wrote: > > > unfortunately this commit, which has been backported to v5.4.x, > > > seems > > > to break RS485 functionality on our iMX boards. > > > > What exactly broke? Are you seeing incorrect polarity after opening > > the tty but correct polarity after the first send? Or is polarity > > always incorrect? > > I'm not sure about the state before opening, I have to measure that > when I'm back at the office. > > After opening, the polarity is always incorrect (inverted) when this > patch is applied. We open the tty and try to receive, which now fails > because the rs485 transmitter is on. Does reception work after you send something? Please provide the contents of the pinctrl_uart2_rs485 node in your DT. Thanks, Lukas
