lkml.org 
[lkml]   [2020]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v3 0/2] Add CTS/RTS gpio support to STM32 UART
Date
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 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

\
 
 \ /
  Last update: 2020-04-20 19:03    [W:0.092 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site