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

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Date:   Fri, 17 Apr 2020 00:30:28 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Fabrice GASNIER <fabrice.gasnier@...com>
Subject: Re: [PATCH v2 0/2] Add CTS/RTS gpio support to STM32 UART

On Thu, Apr 16, 2020 at 8:58 PM <mani@...nel.org> wrote:
>
> 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.
>

Looks good to me,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> 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
>


-- 
With Best Regards,
Andy Shevchenko