[PATCH v1 01/11] arm64: dts: imx8mm-var-som: Move UART4 description to Symphony carrier

Stefano Radaelli stefano.radaelli21 at gmail.com
Tue Feb 17 10:42:35 PST 2026


From: Stefano Radaelli <stefano.r at variscite.com>

The VAR-SOM-MX8MM module does not provide an onboard debug console.
UART4 is routed and exposed only on the Symphony carrier board, while
custom carrier designs may choose to expose a different UART.

Move the UART4 node from the SOM device tree to the
imx8mm-var-som-symphony.dts, keeping the SOM dtsi limited to hardware
present on the module itself.

Signed-off-by: Stefano Radaelli <stefano.r at variscite.com>
---
 .../dts/freescale/imx8mm-var-som-symphony.dts  | 18 ++++++++++++++++++
 .../boot/dts/freescale/imx8mm-var-som.dtsi     | 18 ------------------
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
index affbc67c2ef6..819707e6f3bf 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
@@ -11,6 +11,10 @@ / {
 	model = "Variscite VAR-SOM-MX8MM Symphony evaluation board";
 	compatible = "variscite,var-som-mx8mm-symphony", "variscite,var-som-mx8mm", "fsl,imx8mm";
 
+	chosen {
+		stdout-path = &uart4;
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2-vmmc {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -156,6 +160,13 @@ &uart3 {
 	status = "okay";
 };
 
+/* Console */
+&uart4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart4>;
+	status = "okay";
+};
+
 &usbotg1 {
 	disable-over-current;
 	extcon = <&extcon_usbotg1>, <&extcon_usbotg1>;
@@ -251,4 +262,11 @@ MX8MM_IOMUXC_UART3_RXD_UART3_DCE_RX	0x140
 			MX8MM_IOMUXC_UART3_TXD_UART3_DCE_TX	0x140
 		>;
 	};
+
+	pinctrl_uart4: uart4grp {
+		fsl,pins = <
+			MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX	0x140
+			MX8MM_IOMUXC_UART4_TXD_UART4_DCE_TX	0x140
+		>;
+	};
 };
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
index 190bde4edcd7..b6560c03639e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
@@ -9,10 +9,6 @@
 / {
 	model = "Variscite VAR-SOM-MX8MM module";
 
-	chosen {
-		stdout-path = &uart4;
-	};
-
 	memory at 40000000 {
 		device_type = "memory";
 		reg = <0x0 0x40000000 0 0x80000000>;
@@ -274,13 +270,6 @@ &uart2 {
 	status = "okay";
 };
 
-/* Console */
-&uart4 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_uart4>;
-	status = "okay";
-};
-
 &usbotg1 {
 	dr_mode = "otg";
 	usb-role-switch;
@@ -418,13 +407,6 @@ MX8MM_IOMUXC_SAI3_RXD_UART2_DCE_RTS_B	0x140
 		>;
 	};
 
-	pinctrl_uart4: uart4grp {
-		fsl,pins = <
-			MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX	0x140
-			MX8MM_IOMUXC_UART4_TXD_UART4_DCE_TX	0x140
-		>;
-	};
-
 	pinctrl_usdhc1: usdhc1grp {
 		fsl,pins = <
 			MX8MM_IOMUXC_SD1_CLK_USDHC1_CLK		0x190
-- 
2.47.3




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