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[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
Series serial: 8250: Add rs485 emulation to 8250_dw | expand

Commit Message

Heiko Stuebner May 17, 2020, 9:56 p.m. UTC 
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(+)
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Patch

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
+
   rs485-term-gpios:
     description: GPIO pin to enable RS485 bus termination.
     maxItems: 1