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Thu, 1 Oct 2026 14:18:34 +0000 Date: Thu, 1 Oct 2026 09:18:24 -0500 From: Frank Li To: Ernest Van Hoecke Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Kieran Bingham , Francesco Dolcini , Dave Stevenson , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Ernest Van Hoecke Subject: Re: [PATCH v2 2/6] arm64: dts: freescale: imx8mp-verdin: Add Cortex-M7 UART_4 overlay Message-ID: References: <20261001-verdin-imx8mp-hmp-camera-ready-v2-0-7d1343ecd3ec@toradex.com> <20261001-verdin-imx8mp-hmp-camera-ready-v2-2-7d1343ecd3ec@toradex.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261001-verdin-imx8mp-hmp-camera-ready-v2-2-7d1343ecd3ec@toradex.com> X-ClientProxiedBy: CY3P220CA0003.NAMP220.PROD.OUTLOOK.COM (2603:10b6:930:fb::16) To GV2PR04MB11799.eurprd04.prod.outlook.com (2603:10a6:150:2cf::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GV2PR04MB11799:EE_|MI9PR04MB671332:EE_ X-MS-Office365-Filtering-Correlation-Id: eea8a6db-57a5-4638-04a3-08df1fc6e065 X-LD-Processed: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|19092799006|1800799024|366016|7416014|376014|11063799006|4143699003|10067099003|56012099006|18002099003|22082099003; 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Add an overlay > that marks the UART as reserved so Linux does not claim the port. > > The overlay is also combined with the Verdin iMX8M Plus Development > Board device tree to provide a ready-to-use DTB for the non-WiFi SoM > variant. UART_4 carries Bluetooth on WiFi SoMs. > > Signed-off-by: Ernest Van Hoecke > --- > arch/arm64/boot/dts/freescale/Makefile | 3 +++ > arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso | 14 ++++++++++++++ I remember at another thread said, use imx-uart4-mcu.dtso for all uart4 case. It doesn't affect ov5460 part. Frank > 2 files changed, 17 insertions(+) > > diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile > index 23e2684d6923..649be5b6aab4 100644 > --- a/arch/arm64/boot/dts/freescale/Makefile > +++ b/arch/arm64/boot/dts/freescale/Makefile > @@ -736,6 +736,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia-dsi-to-hdmi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia-panel-cap-touch-10inch-dsi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dahlia.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev-dsi-to-hdmi.dtb > +dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev-uart4-mcu.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-dev.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-ivy.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-mallow.dtb > @@ -744,6 +745,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-yavia.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-nonwifi-zinnia.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-panel-cap-touch-10inch-dsi.dtbo > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-panel-cap-touch-7inch-dsi.dtbo > +dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-uart4-mcu.dtbo > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia-dsi-to-hdmi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia-panel-cap-touch-10inch-dsi.dtb > dtb-$(CONFIG_ARCH_MXC) += imx8mp-verdin-wifi-dahlia.dtb > @@ -761,6 +763,7 @@ imx8mp-verdin-nonwifi-dahlia-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-dahlia.dt > imx8mp-verdin-nonwifi-dahlia-panel-cap-touch-10inch-dsi-dtbs := imx8mp-verdin-nonwifi-dahlia.dtb \ > imx8mp-verdin-panel-cap-touch-10inch-dsi.dtbo > imx8mp-verdin-nonwifi-dev-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-dev.dtb imx8mp-verdin-dsi-to-hdmi.dtbo > +imx8mp-verdin-nonwifi-dev-uart4-mcu-dtbs := imx8mp-verdin-nonwifi-dev.dtb imx8mp-verdin-uart4-mcu.dtbo > imx8mp-verdin-nonwifi-yavia-dsi-to-hdmi-dtbs := imx8mp-verdin-nonwifi-yavia.dtb imx8mp-verdin-dsi-to-hdmi.dtbo > imx8mp-verdin-wifi-dahlia-dsi-to-hdmi-dtbs := imx8mp-verdin-wifi-dahlia.dtb imx8mp-verdin-dsi-to-hdmi.dtbo > imx8mp-verdin-wifi-dahlia-panel-cap-touch-10inch-dsi-dtbs := imx8mp-verdin-wifi-dahlia.dtb \ > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso b/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso > new file mode 100644 > index 000000000000..74d90b39faec > --- /dev/null > +++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin-uart4-mcu.dtso > @@ -0,0 +1,14 @@ > +// SPDX-License-Identifier: GPL-2.0-only OR MIT > +/* > + * Copyright (c) Toradex > + * > + * Verdin iMX8M Plus UART_4 for Cortex-M7 > + */ > + > +/dts-v1/; > +/plugin/; > + > +/* Verdin UART_4 */ > +&uart4 { > + status = "reserved"; > +}; > > -- > 2.43.0 > >