[PATCH v2 3/5] arm64: dts: freescale: imx95-verdin: Add Cortex-M7 UART_4 overlay

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>

Verdin UART_4 can be assigned to Cortex-M7 firmware. Label it uart_mcu
so the shared imx-tdx-uart-mcu overlay can reserve it, and combine the
overlay with the Verdin iMX95 Development Board device tree to provide
a ready-to-use DTB for the WiFi SoM variant. Firmware must configure
the UART and its pads for the intended MCU application.

Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
---
 arch/arm64/boot/dts/freescale/Makefile          | 3 +++
 arch/arm64/boot/dts/freescale/imx95-verdin.dtsi | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 5ee9fa583515..f957797d90a6 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -982,12 +982,15 @@ dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-nonwifi-zinnia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dahlia.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev-uart4-mcu.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-dev.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-ivy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-mallow.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-yavia.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx95-verdin-wifi-zinnia.dtb
 
+imx95-verdin-wifi-dev-uart4-mcu-dtbs := imx95-verdin-wifi-dev.dtb imx-tdx-uart-mcu.dtbo
+
 imx95-15x15-evk-pcie-dtbs += imx95-15x15-evk.dtb imx-m2-pcie.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx95-15x15-evk-pcie.dtb
 
diff --git a/arch/arm64/boot/dts/freescale/imx95-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx95-verdin.dtsi
index 72e7f1e88409..9aa4e8b23ceb 100644
--- a/arch/arm64/boot/dts/freescale/imx95-verdin.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx95-verdin.dtsi
@@ -526,7 +526,7 @@ &lpuart1 {
 };
 
 /* Verdin UART_4 */
-&lpuart2 {
+uart_mcu: &lpuart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart2>;
 };

-- 
2.43.0