Messages in this thread | | | From | mani@kernel ... | Subject | [PATCH v2 0/2] Add CTS/RTS gpio support to STM32 UART | Date | Thu, 16 Apr 2020 23:27:27 +0530 |
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From: Manivannan Sadhasivam <mani@kernel.org>
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
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