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

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Date:   Thu, 16 Apr 2020 23:27:27 +0530
From:   mani@...nel.org
To:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com
Cc:     linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        fabrice.gasnier@...com, andy.shevchenko@...il.com,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: [PATCH v2 0/2] Add CTS/RTS gpio support to STM32 UART

From: Manivannan Sadhasivam <mani@...nel.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