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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/fsl,mu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP i.MX Messaging Unit (MU)
+
+maintainers:
+  - Dong Aisheng <aisheng.dong@nxp.com>
+
+description: |
+  The Messaging Unit module enables two processors within the SoC to
+  communicate and coordinate by passing messages (e.g. data, status
+  and control) through the MU interface. The MU also provides the ability
+  for one processor to signal the other processor using interrupts.
+
+  Because the MU manages the messaging between processors, the MU uses
+  different clocks (from each side of the different peripheral buses).
+  Therefore, the MU must synchronize the accesses from one side to the
+  other. The MU accomplishes synchronization using two sets of matching
+  registers (Processor A-facing, Processor B-facing).
+
+properties:
+  compatible:
+    oneOf:
+      - const: fsl,imx6sx-mu
+      - const: fsl,imx7ulp-mu
+      - const: fsl,imx8ulp-mu
+      - const: fsl,imx8-mu-scu
+      - const: fsl,imx8-mu-seco
+      - const: fsl,imx93-mu-s4
+      - const: fsl,imx8ulp-mu-s4
+      - items:
+          - const: fsl,imx93-mu
+          - const: fsl,imx8ulp-mu
+      - items:
+          - enum:
+              - fsl,imx7s-mu
+              - fsl,imx8mq-mu
+              - fsl,imx8mm-mu
+              - fsl,imx8mn-mu
+              - fsl,imx8mp-mu
+              - fsl,imx8qm-mu
+              - fsl,imx8qxp-mu
+          - const: fsl,imx6sx-mu
+      - description: To communicate with i.MX8 SCU with fast IPC
+        items:
+          - const: fsl,imx8-mu-scu
+          - enum:
+              - fsl,imx8qm-mu
+              - fsl,imx8qxp-mu
+          - const: fsl,imx6sx-mu
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - const: tx
+      - const: rx
+
+  "#mbox-cells":
+    description: |
+      <&phandle type channel>
+      phandle   : Label name of controller
+      type      : Channel type
+      channel   : Channel number
+
+      This MU support 5 type of unidirectional channels, each type
+      has 4 channels except RST channel which only has 1 channel.
+      A total of 17 channels.  Following types are
+      supported:
+      0 - TX channel with 32bit transmit register and IRQ transmit
+          acknowledgment support.
+      1 - RX channel with 32bit receive register and IRQ support
+      2 - TX doorbell channel. Without own register and no ACK support.
+      3 - RX doorbell channel.
+      4 - RST channel
+    const: 2
+
+  clocks:
+    maxItems: 1
+
+  fsl,mu-side-b:
+    description: boolean, if present, means it is for side B MU.
+    type: boolean
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - fsl,imx93-mu-s4
+    then:
+      properties:
+        interrupt-names:
+          minItems: 2
+        interrupts:
+          minItems: 2
+
+    else:
+      properties:
+        interrupts:
+          maxItems: 1
+      not:
+        required:
+          - interrupt-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    mailbox@5d1b0000 {
+        compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
+        reg = <0x5d1b0000 0x10000>;
+        interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
+        #mbox-cells = <2>;
+    };