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Message-Id: <3Zb.ZZsn.wkax8K4so6.1bN6eS@seznam.cz>
Date: Tue, 21 Nov 2023 09:28:12 +0100 (CET)
From: "Tomas Paukrt" <tomaspaukrt@...il.cz>
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: <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH v4 2/2] dt-bindings: serial: Add support for enabling RS485 mode via GPIO at boot time
Add an option to enable the RS485 mode at boot time based on
the state of a GPIO pin (DIP switch or configuration jumper).
The GPIO is defined by the device tree property "linux,rs485-mode-gpio".
Signed-off-by: Tomas Paukrt <tomaspaukrt@...il.cz>
---
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 9418fd6..7a72f37 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -47,6 +47,10 @@ properties:
later with proper ioctl.
$ref: /schemas/types.yaml#/definitions/flag
+ linux,rs485-mode-gpio:
+ description: GPIO pin to enable RS485 mode at boot time.
+ maxItems: 1
+
rs485-rx-during-tx:
description: enables the receiving of data even while sending data.
$ref: /schemas/types.yaml#/definitions/flag
--
2.7.4
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