On Thu, Apr 16, 2020 at 8:58 PM <mani@xxxxxxxxxx> wrote: > > From: Manivannan Sadhasivam <mani@xxxxxxxxxx> > > Hello, > > This patchset adds CTS/RTS gpio support to STM32 UART controller. > Eventhough the UART controller supports using dedicated CTS/RTS gpios, > sometimes we need to use different set of gpios for flow control. > > 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 this patchset > serves as a workaround for that hardware bug and also supports the > usecase of using any gpio for CTS/RTS functionality. As per the sugggestion > provided by Andy for v1, I've now switched to mctrl_gpio driver. > > This patchset has been validated with Stinger96 IoT-Box connected to Murata > WiFi-BT combo chip. > Looks good to me, Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> > Thanks, > Mani > > Changes in v2: > > As per the review by Andy: > > * Switched to mctrl_gpio driver instead of using custom CTS/RTS > implementation > * Removed the use of software flow control terminology. > > Manivannan Sadhasivam (2): > tty: serial: Add modem control gpio support for STM32 UART > dt-bindings: serial: Document CTS/RTS gpios in STM32 UART > > .../bindings/serial/st,stm32-uart.yaml | 14 ++++++ > drivers/tty/serial/Kconfig | 1 + > drivers/tty/serial/stm32-usart.c | 43 ++++++++++++++++++- > drivers/tty/serial/stm32-usart.h | 1 + > 4 files changed, 58 insertions(+), 1 deletion(-) > > -- > 2.17.1 > -- With Best Regards, Andy Shevchenko
