diff --git a/arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi b/arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi
index ee4e585a9c39..6446e6df7a9a 100644
--- a/arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi
@@ -141,6 +141,22 @@ lsio_subsys: bus@5d000000 {
 		status = "disabled";
 	};
 
+	lsio_mu5: mailbox@5d200000 {
+		reg = <0x5d200000 0x10000>;
+		interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>;
+		#mbox-cells = <2>;
+		power-domains = <&pd IMX_SC_R_MU_5A>;
+		status = "disabled";
+	};
+
+	lsio_mu6: mailbox@5d210000 {
+		reg = <0x5d210000 0x10000>;
+		interrupts = <GIC_SPI 185 IRQ_TYPE_LEVEL_HIGH>;
+		#mbox-cells = <2>;
+		power-domains = <&pd IMX_SC_R_MU_6A>;
+		status = "disabled";
+	};
+
 	lsio_mu13: mailbox@5d280000 {
 		reg = <0x5d280000 0x10000>;
 		interrupts = <GIC_SPI 192 IRQ_TYPE_LEVEL_HIGH>;
diff --git a/arch/arm64/boot/dts/freescale/imx8qm-ss-lsio.dtsi b/arch/arm64/boot/dts/freescale/imx8qm-ss-lsio.dtsi
index 30896610c654..669aa14ce9f7 100644
--- a/arch/arm64/boot/dts/freescale/imx8qm-ss-lsio.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8qm-ss-lsio.dtsi
@@ -56,6 +56,14 @@
 	compatible = "fsl,imx8-mu-scu", "fsl,imx8qm-mu", "fsl,imx6sx-mu";
 };
 
+&lsio_mu5 {
+	compatible = "fsl,imx8qm-mu", "fsl,imx6sx-mu";
+};
+
+&lsio_mu6 {
+	compatible = "fsl,imx8qm-mu", "fsl,imx6sx-mu";
+};
+
 &lsio_mu13 {
 	compatible = "fsl,imx8qm-mu", "fsl,imx6sx-mu";
 };
diff --git a/arch/arm64/boot/dts/freescale/imx8qxp-ss-lsio.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp-ss-lsio.dtsi
index 11395479ffc0..8e2152c6eb88 100644
--- a/arch/arm64/boot/dts/freescale/imx8qxp-ss-lsio.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8qxp-ss-lsio.dtsi
@@ -56,6 +56,14 @@
 	compatible = "fsl,imx8-mu-scu", "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
 };
 
+&lsio_mu5 {
+	compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
+};
+
+&lsio_mu6 {
+	compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
+};
+
 &lsio_mu13 {
 	compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
 };