diff --git a/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml b/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
new file mode 100644
index 000000000000..a417ed327413
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pcs/renesas,rzn1-miic.yaml
@@ -0,0 +1,157 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pcs/renesas,rzn1-miic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/N1 MII converter
+
+maintainers:
+  - Clément Léger <clement.leger@bootlin.com>
+
+description: |
+  This MII converter is present on the Renesas RZ/N1 SoC family. It is
+  responsible to do MII passthrough or convert it to RMII/RGMII.
+
+properties:
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  compatible:
+    items:
+      - enum:
+          - renesas,r9a06g032-miic
+      - const: renesas,rzn1-miic
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: MII reference clock
+      - description: RGMII reference clock
+      - description: RMII reference clock
+      - description: AHB clock used for the MII converter register interface
+
+  renesas,miic-switch-portin:
+    description: MII Switch PORTIN configuration. This value should use one of
+      the values defined in dt-bindings/net/pcs-rzn1-miic.h.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2]
+
+patternProperties:
+  "^mii-conv@[0-9]+$":
+    type: object
+    description: MII converter port
+
+    properties:
+      reg:
+        description: MII Converter port number.
+        enum: [1, 2, 3, 4, 5]
+
+      renesas,miic-input:
+        description: Converter input port configuration. This value should use
+          one of the values defined in dt-bindings/net/pcs-rzn1-miic.h.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+    required:
+      - reg
+      - renesas,miic-input
+
+    additionalProperties: false
+
+    allOf:
+      - if:
+          properties:
+            reg:
+              const: 1
+        then:
+          properties:
+            renesas,miic-input:
+              enum: [0]
+      - if:
+          properties:
+            reg:
+              const: 2
+        then:
+          properties:
+            renesas,miic-input:
+              enum: [1, 11]
+      - if:
+          properties:
+            reg:
+              const: 3
+        then:
+          properties:
+            renesas,miic-input:
+              enum: [7, 10]
+      - if:
+          properties:
+            reg:
+              const: 4
+        then:
+          properties:
+            renesas,miic-input:
+              enum: [4, 6, 9, 13]
+      - if:
+          properties:
+            reg:
+              const: 5
+        then:
+          properties:
+            renesas,miic-input:
+              enum: [3, 5, 8, 12]
+
+required:
+  - '#address-cells'
+  - '#size-cells'
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/net/pcs-rzn1-miic.h>
+    #include <dt-bindings/clock/r9a06g032-sysctrl.h>
+
+    eth-miic@44030000 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      compatible = "renesas,r9a06g032-miic", "renesas,rzn1-miic";
+      reg = <0x44030000 0x10000>;
+      clocks = <&sysctrl R9A06G032_CLK_MII_REF>,
+              <&sysctrl R9A06G032_CLK_RGMII_REF>,
+              <&sysctrl R9A06G032_CLK_RMII_REF>,
+              <&sysctrl R9A06G032_HCLK_SWITCH_RG>;
+      renesas,miic-switch-portin = <MIIC_GMAC2_PORT>;
+
+      mii_conv1: mii-conv@1 {
+        renesas,miic-input = <MIIC_GMAC1_PORT>;
+        reg = <1>;
+      };
+
+      mii_conv2: mii-conv@2 {
+        renesas,miic-input = <MIIC_SWITCH_PORTD>;
+        reg = <2>;
+      };
+
+      mii_conv3: mii-conv@3 {
+        renesas,miic-input = <MIIC_SWITCH_PORTC>;
+        reg = <3>;
+      };
+
+      mii_conv4: mii-conv@4 {
+        renesas,miic-input = <MIIC_SWITCH_PORTB>;
+        reg = <4>;
+      };
+
+      mii_conv5: mii-conv@5 {
+        renesas,miic-input = <MIIC_SWITCH_PORTA>;
+        reg = <5>;
+      };
+    };
diff --git a/include/dt-bindings/net/pcs-rzn1-miic.h b/include/dt-bindings/net/pcs-rzn1-miic.h
new file mode 100644
index 000000000000..784782eaec9e
--- /dev/null
+++ b/include/dt-bindings/net/pcs-rzn1-miic.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (C) 2022 Schneider-Electric
+ *
+ * Clément Léger <clement.leger@bootlin.com>
+ */
+
+#ifndef _DT_BINDINGS_PCS_RZN1_MIIC
+#define _DT_BINDINGS_PCS_RZN1_MIIC
+
+/*
+ * Reefer to the datasheet [1] section 8.2.1, Internal Connection of Ethernet
+ * Ports to check the available combination
+ *
+ * [1] REN_r01uh0750ej0140-rzn1-introduction_MAT_20210228.pdf
+ */
+
+#define MIIC_GMAC1_PORT			0
+#define MIIC_GMAC2_PORT			1
+#define MIIC_RTOS_PORT			2
+#define MIIC_SERCOS_PORTA		3
+#define MIIC_SERCOS_PORTB		4
+#define MIIC_ETHERCAT_PORTA		5
+#define MIIC_ETHERCAT_PORTB		6
+#define MIIC_ETHERCAT_PORTC		7
+#define MIIC_SWITCH_PORTA		8
+#define MIIC_SWITCH_PORTB		9
+#define MIIC_SWITCH_PORTC		10
+#define MIIC_SWITCH_PORTD		11
+#define MIIC_HSR_PORTA			12
+#define MIIC_HSR_PORTB			13
+
+#endif
