linux-kernel - Re: [PATCH v4 2/2] dt-bindings: serial: Add support for enabling RS485 mode via GPIO at boot time

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Message-ID: <20231127200123.GA2896702-robh@kernel.org>
Date:   Mon, 27 Nov 2023 14:01:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tomas Paukrt <tomaspaukrt@...il.cz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: serial: Add support for enabling
 RS485 mode via GPIO at boot time

On Tue, Nov 21, 2023 at 09:28:12AM +0100, Tomas Paukrt wrote:
> Add an option to enable the RS485 mode at boot time based on
> the state of a GPIO pin (DIP switch or configuration jumper).
> The GPIO is defined by the device tree property "linux,rs485-mode-gpio".
> 
> Signed-off-by: Tomas Paukrt <tomaspaukrt@...il.cz>
> ---
>  Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
> index 9418fd6..7a72f37 100644
> --- a/Documentation/devicetree/bindings/serial/rs485.yaml
> +++ b/Documentation/devicetree/bindings/serial/rs485.yaml
> @@ -47,6 +47,10 @@ properties:
>        later with proper ioctl.
>      $ref: /schemas/types.yaml#/definitions/flag
> 
> +  linux,rs485-mode-gpio:

This has little to do with Linux, so no need for linux prefix.

The preferred form is always plural '-gpios'.

> +    description: GPIO pin to enable RS485 mode at boot time.
> +    maxItems: 1
> +
>    rs485-rx-during-tx:
>      description: enables the receiving of data even while sending data.
>      $ref: /schemas/types.yaml#/definitions/flag
> --
> 2.7.4
>