linux-kernel - [PATCH] ARM: dts: imx6ul-kontron-bl-common: Fix RTS polarity for RS485 interface

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Message-ID: <20250708122442.53829-1-frieder@fris.de>
Date: Tue,  8 Jul 2025 14:24:41 +0200
From: Frieder Schrempf <frieder@...s.de>
To: linux-arm-kernel@...ts.infradead.org,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	Fabio Estevam <festevam@...il.com>,
	Frieder Schrempf <frieder.schrempf@...tron.de>,
	imx@...ts.linux.dev,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>
Cc: Annette Kobou <annette.kobou@...tron.de>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: [PATCH] ARM: dts: imx6ul-kontron-bl-common: Fix RTS polarity for RS485 interface

From: Annette Kobou <annette.kobou@...tron.de>

The polarity of the DE signal of the transceiver is active-high for
sending. Therefore rs485-rts-active-low is wrong and needs to be
removed to make RS485 transmissions work.

Signed-off-by: Annette Kobou <annette.kobou@...tron.de>
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Fixes: 1ea4b76cdfde ("ARM: dts: imx6ul-kontron-n6310: Add Kontron i.MX6UL N6310 SoM and boards")
---
 arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
index 29d2f86d5e34a..f4c45e964daf8 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-kontron-bl-common.dtsi
@@ -168,7 +168,6 @@ &uart2 {
 	pinctrl-0 = <&pinctrl_uart2>;
 	linux,rs485-enabled-at-boot-time;
 	rs485-rx-during-tx;
-	rs485-rts-active-low;
 	uart-has-rtscts;
 	status = "okay";
 };
-- 
2.50.0