From 0c4a972d869eff8070685c055b6a9366d6c63710 Mon Sep 17 00:00:00 2001 From: Ernest Van Hoecke Date: Fri, 24 Jul 2026 18:24:33 +0200 Subject: [PATCH] arm64: dts: freescale: imx8mm-verdin: Add Cortex-M4F UART_4 overlay Verdin UART_4 can be assigned to Cortex-M4F firmware. 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 Mini Development Board device tree to provide a ready-to-use DTB for the WiFi SoM variant. Signed-off-by: Ernest Van Hoecke Signed-off-by: Frank Li --- arch/arm64/boot/dts/freescale/Makefile | 3 +++ .../dts/freescale/imx8mm-verdin-uart4-mcu.dtso | 14 ++++++++++++++ 2 files changed, 17 insertions(+) create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-verdin-uart4-mcu.dtso diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile index fe261d7bdab5..95ae85ab4adf 100644 --- a/arch/arm64/boot/dts/freescale/Makefile +++ b/arch/arm64/boot/dts/freescale/Makefile @@ -192,6 +192,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-yavia.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-nonwifi-zinnia.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-panel-cap-touch-10inch-dsi.dtbo dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-panel-cap-touch-7inch-dsi.dtbo +dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-uart4-mcu.dtbo dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dahlia-dsi-to-hdmi.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dahlia-panel-cap-touch-10inch-dsi.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dahlia.dtb @@ -199,6 +200,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev-dsi-to-hdmi.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev-dsi-to-lvds-panel-cap-touch-10inch.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev-nau8822-btl.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev-panel-cap-touch-7inch-dsi.dtb +dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev-uart4-mcu.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-dev.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-ivy.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-verdin-wifi-mallow.dtb @@ -220,6 +222,7 @@ imx8mm-verdin-wifi-dev-dsi-to-lvds-panel-cap-touch-10inch-dtbs := imx8mm-verdin- imx8mm-verdin-wifi-dev-nau8822-btl-dtbs := imx8mm-verdin-wifi-dev.dtb imx8mm-verdin-dev-nau8822-btl.dtbo imx8mm-verdin-wifi-dev-panel-cap-touch-7inch-dsi-dtbs := imx8mm-verdin-wifi-dev.dtb \ imx8mm-verdin-panel-cap-touch-7inch-dsi.dtbo +imx8mm-verdin-wifi-dev-uart4-mcu-dtbs := imx8mm-verdin-wifi-dev.dtb imx8mm-verdin-uart4-mcu.dtbo imx8mm-verdin-wifi-yavia-dsi-to-hdmi-dtbs := imx8mm-verdin-wifi-yavia.dtb imx8mm-verdin-dsi-to-hdmi.dtbo imx8mm-tqma8mqml-mba8mx-lvds-g133han01-dtbs += imx8mm-tqma8mqml-mba8mx.dtb imx8mm-tqma8mqml-mba8mx-lvds-g133han01.dtbo diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin-uart4-mcu.dtso b/arch/arm64/boot/dts/freescale/imx8mm-verdin-uart4-mcu.dtso new file mode 100644 index 000000000000..8dbecffe9e7b --- /dev/null +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin-uart4-mcu.dtso @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0-or-later OR MIT +/* + * Copyright (c) Toradex + * + * Verdin iMX8M Mini UART_4 for Cortex-M4F + */ + +/dts-v1/; +/plugin/; + +/* Verdin UART_4 */ +&uart4 { + status = "reserved"; +};