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

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Message-ID: <aHDF2VPGraI5ceXZ@dragon>
Date: Fri, 11 Jul 2025 16:05:45 +0800
From: Shawn Guo <shawnguo2@...h.net>
To: Frieder Schrempf <frieder@...s.de>
Cc: 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>,
	Annette Kobou <annette.kobou@...tron.de>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH] ARM: dts: imx6ul-kontron-bl-common: Fix RTS polarity for
 RS485 interface

On Tue, Jul 08, 2025 at 02:24:41PM +0200, Frieder Schrempf wrote:
> 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")

Applied, thanks!