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diff --git a/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml b/Documentation/devicetree/bindings/serial/renesas,em-uart.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/renesas,em-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas EMMA Mobile UART Interface
+
+maintainers:
+  - Magnus Damm <magnus.damm@gmail.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - renesas,r9a09g011-uart    # RZ/V2M
+          - const: renesas,em-uart        # generic EMMA Mobile compatible UART
+
+      - items:
+          - const: renesas,em-uart        # generic EMMA Mobile compatible UART
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: UART functional clock
+      - description: Internal clock to access the registers
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: sclk
+      - const: pclk
+
+allOf:
+  - $ref: serial.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g011-uart
+    then:
+      properties:
+        clocks:
+          minItems: 2
+        clock-names:
+          minItems: 2
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    uart0: serial@e1020000 {
+        compatible = "renesas,em-uart";
+        reg = <0xe1020000 0x38>;
+        interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&usia_u0_sclk>;
+        clock-names = "sclk";
+    };