linux-kernel - Re: [Linux-stm32] [PATCH v3 1/2] dt-bindings: serial: Document CTS/RTS gpios in STM32 UART

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Date:   Mon, 18 May 2020 07:25:47 +0000
From:   Erwan LE RAY <erwan.leray@...com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "mani@...nel.org" <mani@...nel.org>
CC:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Greg KH <gregkh@...uxfoundation.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Maxime Coquelin" <mcoquelin.stm32@...il.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linux-stm32] [PATCH v3 1/2] dt-bindings: serial: Document
 CTS/RTS gpios in STM32 UART

Hi Geert,


On 5/18/20 9:04 AM, Geert Uytterhoeven wrote:
> Hi Mani,
>
> On Mon, Apr 20, 2020 at 7:02 PM <mani@...nel.org> wrote:
>> From: Manivannan Sadhasivam <mani@...nel.org>
>>
>> Document the use of CTS/RTS gpios for flow control in STM32 UART
>> controller. These properties can be used instead of 'st,hw-flow-ctrl'
>> for making use of any gpio pins for flow control instead of dedicated
>> pins. It should be noted that both CTS/RTS and 'st,hw-flow-ctrl'
>> properties cannot co-exist in a design.
>>
>> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
>> Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
>> --- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
>> +++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
>> @@ -55,6 +61,14 @@ properties:
>>     linux,rs485-enabled-at-boot-time: true
>>     rs485-rx-during-tx: true
>>
>> +if:
>> +  required:
>> +    - st,hw-flow-ctrl
> Perhaps "st,hw-flow-ctrl" should be deprecated, in favor of the standard
> "uart-has-rtscts" property?
> Of course the driver needs to gain support for the latter first.

You're fully right, the patch to deprecate "st, hw-flow-ctrl" and 
introduce generic "uart-has-rtscts" property in the driver is ready and 
will be sent this week on top of Mani patch.


>
>> +then:
>> +  properties:
>> +    cts-gpios: false
>> +    rts-gpios: false
>> +
>>   required:
>>     - compatible
>>     - reg
> Gr{oetje,eeting}s,
>
>                          Geert
>