[PATCH v2 0/2] Add CTS/RTS gpio support to STM32 UART

From: mani
Date: Thu Apr 16 2020 - 13:58:23 EST


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 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