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. Thanks, Mani Changes in v3: * Added Andy's reviewed-by tag * Fixed minor issues spotted by Fabrice 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): dt-bindings: serial: Document CTS/RTS gpios in STM32 UART tty: serial: Add modem control gpio support for STM32 UART .../bindings/serial/st,stm32-uart.yaml | 14 +++++ drivers/tty/serial/Kconfig | 1 + drivers/tty/serial/stm32-usart.c | 53 ++++++++++++++++++- drivers/tty/serial/stm32-usart.h | 1 + 4 files changed, 67 insertions(+), 2 deletions(-) -- 2.17.1
