From: mani@kernel.org
To: gregkh@linuxfoundation.org, robh+dt@kernel.org,
mcoquelin.stm32@gmail.com, alexandre.torgue@st.com
Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, fabrice.gasnier@st.com,
andy.shevchenko@gmail.com,
Manivannan Sadhasivam <mani@kernel.org>
Subject: [PATCH v3 0/2] Add CTS/RTS gpio support to STM32 UART
Date: Mon, 20 Apr 2020 22:32:02 +0530 [thread overview]
Message-ID: <20200420170204.24541-1-mani@kernel.org> (raw)
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
next reply other threads:[~2020-04-20 17:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 17:02 mani [this message]
2020-04-20 17:02 ` [PATCH v3 1/2] dt-bindings: serial: Document CTS/RTS gpios in STM32 UART mani
2020-05-06 19:59 ` Rob Herring
2020-05-18 7:04 ` Geert Uytterhoeven
2020-05-18 7:25 ` [Linux-stm32] " Erwan LE RAY
2020-04-20 17:02 ` [PATCH v3 2/2] tty: serial: Add modem control gpio support for " mani
2020-04-21 12:58 ` Fabrice Gasnier
2020-05-07 14:07 ` [PATCH v3 0/2] Add CTS/RTS gpio support to " Manivannan Sadhasivam
2020-05-07 15:34 ` Greg KH
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