From patchwork Mon Jan 6 16:06:42 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 13927658 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5FDD7E77188 for ; Mon, 6 Jan 2025 16:15:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/MxNRP3B1WjEHO6fS7xHIZNcuo8McnpWuJM7vdeXhqU=; b=pm6FY0Hxfo5VuxA8i0eN7NgjQ/ yez+oyCQTcbolpDtQxuLHRoyomPvuTXVlgZ/AZYQlFqTVPD2mhTHjpc34DudXIGMSyjvaw2V4mGOT QmzbobQ3nTWSpyc+vSnL0ITDlTZ6yBXP+MV1axm98V3Z1cdK92pkbX6Sfjs7sQxYJr/xWF0v7yjPS p+7w4Nj98khprUmEP2drp8HxrT5CIw+9m8Ou/devJV5SZqPOyn3rSAThAHi2Xqm2eN0j0JzC2GXAv gwLrwxG/5mvqGCaWPg48SzIqtvY2B6BH2uX83/PPgihwCtIagXzRHDFE/rZoALQWr2k5tlymaeXlM 31Qifpnw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tUpl6-00000001ufA-2lYQ; Mon, 06 Jan 2025 16:15:16 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tUpdJ-00000001tYI-1YMn for linux-arm-kernel@bombadil.infradead.org; Mon, 06 Jan 2025 16:07:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Cc:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Sender:Reply-To:Content-ID:Content-Description; bh=/MxNRP3B1WjEHO6fS7xHIZNcuo8McnpWuJM7vdeXhqU=; b=Ua4D7ObCtJ/R3TJyrRJO9QyqW2 pULsNKmtU+1+j5zvr1QZ1y9yqOxVCpVy06TikUYgCHlvhBaAuoxH17ygPl4+GrFc9hsYMDXhovv9s VfNAgmvw1sbuzv/cjBC9MJCcPkQsIvq0UQAwjANuVBzDd0ylvirPzF7VHDjrLWknSt4uI/dPrkFsJ bN1DdkcOI4XWEuwiw/5HxWsfS2K+bHcoOytqU0vN2Rx0YbEzsOVY7a1FEYq12l/T32TdkXfiygdOP Q2RxBG9C7ARTwkXu8JbbIrJaAgzOMp2tAnmiHECZ1c42ypfRctOvSETdIHlM8W1BRsS6ODLecu8vS M9D7/Vng==; Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by desiato.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tUpdG-00000008xqN-2cRG for linux-arm-kernel@lists.infradead.org; Mon, 06 Jan 2025 16:07:12 +0000 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 1tUpcx-0000C8-KC; Mon, 06 Jan 2025 17:06:51 +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 1tUpcw-007C9r-15; Mon, 06 Jan 2025 17:06:51 +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 1tUpcw-009dVc-38; Mon, 06 Jan 2025 17:06:50 +0100 From: Ahmad Fatoum Date: Mon, 06 Jan 2025 17:06:42 +0100 Subject: [PATCH v2 07/10] arm64: dts: imx8mp-skov: configure uart1 for RS485 MIME-Version: 1.0 Message-Id: <20250106-skov-dt-updates-v2-7-4504d3f00ecb@pengutronix.de> References: <20250106-skov-dt-updates-v2-0-4504d3f00ecb@pengutronix.de> In-Reply-To: <20250106-skov-dt-updates-v2-0-4504d3f00ecb@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, Frank Li , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, Ahmad Fatoum X-Mailer: b4 0.14.2 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-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250106_160710_839864_A076956B X-CRM114-Status: GOOD ( 12.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 --- v1 -> v2: - no change --- 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/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi index 7ae686d37ddaca7a323e2cb1ec7d807c2e3bd3f5..bce23d62cd277b89ec9ce5ed3651cfe787987158 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 = "default"; pinctrl-0 = <&pinctrl_uart1>; status = "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; }; &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 >; };