linux-kernel - [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO

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Date:   Thu, 26 Mar 2020 00:14:20 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     gregkh@...uxfoundation.org
Cc:     jslaby@...e.com, andriy.shevchenko@...ux.intel.com,
        matwey.kornilov@...il.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, heiko@...ech.de, lukas@...ner.de,
        christoph.muellner@...obroma-systems.com,
        giulio.benetti@...ronovasrl.com,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
Subject: [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO

From: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>

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 <heiko.stuebner@...obroma-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..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