On Mon, Apr 13, 2020 at 7:06 AM <mani@xxxxxxxxxx> wrote: > > From: Manivannan Sadhasivam <mani@xxxxxxxxxx> > > Hello, > > This patchset adds software flow control support for STM32 UART controller. > This is necessary for the upcoming STM32MP1 based board called Stinger96 > IoT-Box. On that board, a bluetooth chip is connected to one of the UART > controller but the CTS/RTS lines got swapped mistakenly. So in order to > workaround that hardware bug and also to support the usecase of using only > Tx/Rx pins, this patchset adds software flow control support. > > This patchset has been validated w/ Stinger96 IoT-Box connected to Murata > WiFi-BT combo chip. > I think it's a mix of terminology or so. Looking into the patches I found that it's required to have GPIOs for SW flow control. No, SW flow control does not require any additional signals, except RxD/TxD. On top of that, it seems you adding mctrl-gpio functionality. Why can't you use that one? And thus no bindings needs to be updated. > Thanks, > Mani > > Manivannan Sadhasivam (2): > dt-bindings: serial: Add binding for software flow control in STM32 > UART > tty: serial: Add software flow control support for STM32 USART > > .../bindings/serial/st,stm32-uart.yaml | 15 +- > drivers/tty/serial/stm32-usart.c | 143 +++++++++++++++++- > drivers/tty/serial/stm32-usart.h | 4 + > 3 files changed, 155 insertions(+), 7 deletions(-) > > -- > 2.17.1 > -- With Best Regards, Andy Shevchenko
