linux-kernel - [PATCH 1/2] dt-bindings: serial: rs485: add rs485-mux-gpios binding

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Date:   Mon, 20 Nov 2023 16:10:54 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     devicetree@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: serial: rs485: add rs485-mux-gpios binding

Some boards are capable of both rs232 and rs485, and control which
external terminals are active via a gpio-controlled mux. Allow
describing that gpio in DT so that the kernel can transparently handle
the proper setting when the uart is switched between rs232 and rs485
modes.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 Documentation/devicetree/bindings/serial/rs485.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
index 9418fd66a8e9..e8136c7d22ed 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -61,6 +61,11 @@ properties:
       the active state enables RX during TX.
     maxItems: 1
 
+  rs485-mux-gpios:
+    description: GPIO pin to control muxing of the SOC signals to the RS485
+      transceiver.
+    maxItems: 1
+
 additionalProperties: true
 
 ...
-- 
2.40.1.1.g1c60b9335d