[v3,2/5] dt-bindings: serial: Add binding for rs485 receiver enable GPIO

Message ID 20200517215610.2131618-3-heiko@sntech.de
State New
Headers show
  • serial: 8250: Add rs485 emulation to 8250_dw
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Commit Message

Heiko Stübner May 17, 2020, 9:56 p.m.
From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

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@theobroma-systems.com>
 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..c61226c235f0 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
+    maxItems: 1
     description: GPIO pin to enable RS485 bus termination.
     maxItems: 1