From 84c5b74d4658c0c4c65e5dff6aad90be4278c2f6 Mon Sep 17 00:00:00 2001 From: Heiko Stuebner Date: Wed, 25 Mar 2020 17:06:25 +0100 Subject: [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO RS485 has two signals to control transmissions "drivee enable" (RE) and "receiver enable" (DE). RE is already handled via the uarts RTS signal while 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 --- 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 a9ad17864889..e55730de796d 100644 --- a/Documentation/devicetree/bindings/serial/rs485.yaml +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -44,6 +44,10 @@ properties: description: enables the receiving of data even while sending data. $ref: /schemas/types.yaml#/definitions/flag + rs485-rx-enable-gpios: + description: GPIO to handle a separate RS485 receive enable signal + $ref: /schemas/types.yaml#/definitions/flag + rs485-term-gpios: description: GPIO pin to enable RS485 bus termination. maxItems: 1 -- 2.24.1