linux-kernel - Re: [PATCH 1/2] dt-bindings: serial: rs485: add rs485-mux-gpios binding

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Date:   Tue, 21 Nov 2023 08:52:43 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     devicetree@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: serial: rs485: add rs485-mux-gpios
 binding

On 20/11/2023 16:10, Rasmus Villemoes wrote:
> Some boards are capable of both rs232 and rs485, and control which
> external terminals are active via a gpio-controlled mux. Allow
> describing that gpio in DT so that the kernel can transparently handle
> the proper setting when the uart is switched between rs232 and rs485
> modes.
> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  Documentation/devicetree/bindings/serial/rs485.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
> index 9418fd66a8e9..e8136c7d22ed 100644
> --- a/Documentation/devicetree/bindings/serial/rs485.yaml
> +++ b/Documentation/devicetree/bindings/serial/rs485.yaml
> @@ -61,6 +61,11 @@ properties:
>        the active state enables RX during TX.
>      maxItems: 1
>  
> +  rs485-mux-gpios:
> +    description: GPIO pin to control muxing of the SOC signals to the RS485
> +      transceiver.
> +    maxItems: 1

Aren't you duplicating
https://lore.kernel.org/all/3Nk.ZZrp.5w3Yn0Ecy5C.1bMzDp@seznam.cz/ ?

Anyway, similar comments: this does not look like generic RS485
property. Are you saying that standard defines such GPIO?


Best regards,
Krzysztof