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diff --git a/Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/ralink,rt2880-pinmux.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/ralink,rt2880-pinmux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ralink rt2880 pinmux controller
+
+maintainers:
+  - Sergio Paracuellos <sergio.paracuellos@gmail.com>
+
+description:
+  The rt2880 pinmux can only set the muxing of pin groups. muxing indiviual pins
+  is not supported. There is no pinconf support.
+
+properties:
+  compatible:
+    const: ralink,rt2880-pinmux
+
+patternProperties:
+  '-pins$':
+    type: object
+    patternProperties:
+      '^(.*-)?pinmux$':
+        type: object
+        description: node for pinctrl.
+        $ref: pinmux-node.yaml#
+
+        properties:
+          groups:
+            description: Name of the pin group to use for the functions.
+            enum: [i2c, spi, uart1, uart2, uart3, rgmii1, rgmii2, mdio,
+                   pcie, sdhci]
+          function:
+            description: The mux function to select
+            enum: [gpio, i2c, spi, uart1, uart2, uart3, rgmii1, rgmii2,
+                   mdio, nand1, nand2, sdhci]
+
+        required:
+          - groups
+          - function
+
+        additionalProperties: false
+
+    additionalProperties: false
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  # Pinmux controller node
+  - |
+    pinctrl {
+      compatible = "ralink,rt2880-pinmux";
+
+      i2c_pins: i2c0-pins {
+        pinmux {
+          groups = "i2c";
+          function = "i2c";
+        };
+      };
+    };