diff mbox series

[v5,1/6] dt-bindings: serial: Add binding for rs485 receiver enable GPIO

Message ID 20240126-dev-rx-enable-v5-1-5d934eda05ca@theobroma-systems.com
State New
Headers
Series serial: 8250: Add support for rs485 half/full duplex on puma/ringneck-haikou |

Commit Message

Farouk Bouabid Jan. 26, 2024, 5:27 p.m. UTC 
  From: Heiko Stuebner <heiko.stuebner@cherry.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@cherry.de>
Signed-off-by: Farouk Bouabid <farouk.bouabid@theobroma-systems.com>
---
 Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Rob Herring Jan. 30, 2024, 10:56 p.m. UTC | #1 
On Fri, 26 Jan 2024 18:27:42 +0100, Farouk Bouabid wrote:
> From: Heiko Stuebner <heiko.stuebner@cherry.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@cherry.de>
> Signed-off-by: Farouk Bouabid <farouk.bouabid@theobroma-systems.com>
> ---
>  Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
index 9418fd66a8e9..b64577036b5c 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -51,6 +51,10 @@  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