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diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,mt7621-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,mt7621-pinctrl.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/mediatek,mt7621-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT7621 Pin Controller
+
+maintainers:
+  - Arınç ÜNAL <arinc.unal@arinc9.com>
+  - Sergio Paracuellos <sergio.paracuellos@gmail.com>
+
+description: |
+  MediaTek MT7621 pin controller for MT7621 SoC.
+  The pin controller can only set the muxing of pin groups. Muxing individual
+  pins is not supported. There is no pinconf support.
+
+properties:
+  compatible:
+    const: ralink,mt7621-pinctrl
+
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+
+    patternProperties:
+      '^(.*-)?pinmux$':
+        type: object
+        description: node for pinctrl.
+        $ref: pinmux-node.yaml#
+        additionalProperties: false
+
+        properties:
+          function:
+            description:
+              A string containing the name of the function to mux to the group.
+            enum: [gpio, i2c, i2s, jtag, mdio, nand1, nand2, pcie refclk,
+                   pcie rst, pcm, rgmii1, rgmii2, sdhci, spdif2, spdif3, spi,
+                   uart1, uart2, uart3, wdt refclk, wdt rst]
+
+          groups:
+            description:
+              An array of strings. Each string contains the name of a group.
+            maxItems: 1
+
+        required:
+          - groups
+          - function
+
+        allOf:
+          - if:
+              properties:
+                function:
+                  const: gpio
+            then:
+              properties:
+                groups:
+                  enum: [i2c, jtag, mdio, pcie, rgmii1, rgmii2, sdhci, spi,
+                         uart1, uart2, uart3, wdt]
+
+          - if:
+              properties:
+                function:
+                  const: i2c
+            then:
+              properties:
+                groups:
+                  enum: [i2c]
+
+          - if:
+              properties:
+                function:
+                  const: i2s
+            then:
+              properties:
+                groups:
+                  enum: [uart3]
+
+          - if:
+              properties:
+                function:
+                  const: jtag
+            then:
+              properties:
+                groups:
+                  enum: [jtag]
+
+          - if:
+              properties:
+                function:
+                  const: mdio
+            then:
+              properties:
+                groups:
+                  enum: [mdio]
+
+          - if:
+              properties:
+                function:
+                  const: nand1
+            then:
+              properties:
+                groups:
+                  enum: [spi]
+
+          - if:
+              properties:
+                function:
+                  const: nand2
+            then:
+              properties:
+                groups:
+                  enum: [sdhci]
+
+          - if:
+              properties:
+                function:
+                  const: pcie refclk
+            then:
+              properties:
+                groups:
+                  enum: [pcie]
+
+          - if:
+              properties:
+                function:
+                  const: pcie rst
+            then:
+              properties:
+                groups:
+                  enum: [pcie]
+
+          - if:
+              properties:
+                function:
+                  const: pcm
+            then:
+              properties:
+                groups:
+                  enum: [uart2]
+
+          - if:
+              properties:
+                function:
+                  const: rgmii1
+            then:
+              properties:
+                groups:
+                  enum: [rgmii1]
+
+          - if:
+              properties:
+                function:
+                  const: rgmii2
+            then:
+              properties:
+                groups:
+                  enum: [rgmii2]
+
+          - if:
+              properties:
+                function:
+                  const: sdhci
+            then:
+              properties:
+                groups:
+                  enum: [sdhci]
+
+          - if:
+              properties:
+                function:
+                  const: spdif2
+            then:
+              properties:
+                groups:
+                  enum: [uart2]
+
+          - if:
+              properties:
+                function:
+                  const: spdif3
+            then:
+              properties:
+                groups:
+                  enum: [uart3]
+
+          - if:
+              properties:
+                function:
+                  const: spi
+            then:
+              properties:
+                groups:
+                  enum: [spi]
+
+          - if:
+              properties:
+                function:
+                  const: uart1
+            then:
+              properties:
+                groups:
+                  enum: [uart1]
+
+          - if:
+              properties:
+                function:
+                  const: uart2
+            then:
+              properties:
+                groups:
+                  enum: [uart2]
+
+          - if:
+              properties:
+                function:
+                  const: uart3
+            then:
+              properties:
+                groups:
+                  enum: [uart3]
+
+          - if:
+              properties:
+                function:
+                  const: wdt refclk
+            then:
+              properties:
+                groups:
+                  enum: [wdt]
+
+          - if:
+              properties:
+                function:
+                  const: wdt rst
+            then:
+              properties:
+                groups:
+                  enum: [wdt]
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    pinctrl {
+      compatible = "ralink,mt7621-pinctrl";
+
+      i2c_pins: i2c0-pins {
+        pinmux {
+          groups = "i2c";
+          function = "i2c";
+        };
+      };
+    };