linux-kernel - Re: [PATCH v5 1/6] dt-bindings: serial: Add binding for rs485 receiver enable GPIO

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Date: Tue, 30 Jan 2024 16:56:54 -0600
From: Rob Herring <robh@...nel.org>
To: Farouk Bouabid <farouk.bouabid@...obroma-systems.com>
Cc: Conor Dooley <conor+dt@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	linux-serial@...r.kernel.org,
	Heiko Stuebner <heiko.stuebner@...rry.de>,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	quentin.schulz@...obroma-systems.com,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH v5 1/6] dt-bindings: serial: Add binding for rs485
 receiver enable GPIO


On Fri, 26 Jan 2024 18:27:42 +0100, Farouk Bouabid wrote:
> From: Heiko Stuebner <heiko.stuebner@...rry.de>
> 
> RS485 has two signals to control transmissions "driver enable" (DE) and
> "receiver enable" (RE). DE is already handled via the uarts RTS signal
> while the RE signal on most implementations doesn't get handled
> separately at all.
> 
> As there still will be cases where this is needed though add a gpio
> property for declaring this signal pin.
> 
> Signed-off-by: Heiko Stuebner <heiko.stuebner@...rry.de>
> Signed-off-by: Farouk Bouabid <farouk.bouabid@...obroma-systems.com>
> ---
>  Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Reviewed-by: Rob Herring <robh@...nel.org>