From nobody Fri Dec 19 04:52:55 2025 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 28FF3217679 for ; Thu, 19 Dec 2024 07:25:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734593153; cv=none; b=AShlg3tQG0DzmHVb8mPiCL0F/rUJgKG6RMCMCZuv1+d8aPB3oP2FM6UkvHA9m+F7Gg6bUytsuXV50qyaRSH7ahrVKUTwp4YXGx5beMxlvSgBwmE/N+GvxglRMQpgg4eryDxolQ1aujA3rsvB4BCIkJ8BTWkcFXbMKjckjFT5AoI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734593153; c=relaxed/simple; bh=64Yf9rLnu9/J/wxGl1OP/jkO1/LFlql87gQlHovGbIc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WQ4PoH402+owhQIhu8z8sJT1eqeUtV0kohIBERprl/QVfeobQ47jXZSRylqhfG2P4JHcBbVNKQSuDcQgyu0lky1ZXNnEqhU5KRxxeLeO8AAU7NJL3BLanlAVJCDAXSeYfTSZRZkTXUlXuwG1XB5eAqV21m1hg80i/p3OxpiU93Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tOAuc-00064O-1t; Thu, 19 Dec 2024 08:25:34 +0100 Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tOAua-004AOG-2u; Thu, 19 Dec 2024 08:25:33 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1tOAub-00GenW-1k; Thu, 19 Dec 2024 08:25:33 +0100 From: Ahmad Fatoum Date: Thu, 19 Dec 2024 08:25:31 +0100 Subject: [PATCH 07/10] arm64: dts: imx8mp-skov: configure uart1 for RS485 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241219-skov-dt-updates-v1-7-38bf80dc22df@pengutronix.de> References: <20241219-skov-dt-updates-v1-0-38bf80dc22df@pengutronix.de> In-Reply-To: <20241219-skov-dt-updates-v1-0-38bf80dc22df@pengutronix.de> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Oleksij Rempel Cc: devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, Ahmad Fatoum X-Mailer: b4 0.13-dev X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: a.fatoum@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org uart1 TX, RX and RTS signals go off the base board and to a RS485 transceiver. Describe this in the device tree. Signed-off-by: Ahmad Fatoum --- arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi b/arch/arm= 64/boot/dts/freescale/imx8mp-skov-reva.dtsi index 7ae686d37dda..bce23d62cd27 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi @@ -404,6 +404,13 @@ &uart1 { pinctrl-names =3D "default"; pinctrl-0 =3D <&pinctrl_uart1>; status =3D "okay"; + /* + * While there is no CTS line, the property "uart-has-rtscts" is still + * the right thing to do to enable the UART to do RS485. In RS485-Mode + * CTS isn't used anyhow and there is no dedicated property + * "uart-has-rts-but-no-cts". + */ + uart-has-rtscts; }; =20 &uart2 { @@ -618,6 +625,8 @@ pinctrl_uart1: uart1grp { MX8MP_IOMUXC_UART1_RXD__UART1_DCE_RX 0x140 MX8MP_IOMUXC_UART1_TXD__UART1_DCE_TX 0x140 MX8MP_IOMUXC_UART3_RXD__UART1_DTE_RTS 0x140 + /* CTS pin is not connected, but needed as workaround */ + MX8MP_IOMUXC_UART3_TXD__UART1_DTE_CTS 0x140 >; }; =20 --=20 2.39.5