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diff --git a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2400-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2400-pinctrl.yaml
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+# SPDX-License-Identifier: GPL-2.0-or-later
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/aspeed,ast2400-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED AST2400 Pin Controller
+
+maintainers:
+  - Andrew Jeffery <andrew@aj.id.au>
+
+description: |+
+  The pin controller node should be the child of a syscon node with the
+  required property:
+
+  - compatible:     Should be one of the following:
+                    "aspeed,ast2400-scu", "syscon", "simple-mfd"
+
+  Refer to the the bindings described in
+  Documentation/devicetree/bindings/mfd/syscon.txt
+
+properties:
+  compatible:
+    const: aspeed,ast2400-pinctrl
+
+patternProperties:
+  '^.*$':
+    if:
+      type: object
+    then:
+      patternProperties:
+        "^function|groups$":
+          allOf:
+            - $ref: "/schemas/types.yaml#/definitions/string"
+            - enum: [ ACPI, ADC0, ADC1, ADC10, ADC11, ADC12, ADC13, ADC14,
+              ADC15, ADC2, ADC3, ADC4, ADC5, ADC6, ADC7, ADC8, ADC9, BMCINT,
+              DDCCLK, DDCDAT, EXTRST, FLACK, FLBUSY, FLWP, GPID, GPID0, GPID2,
+              GPID4, GPID6, GPIE0, GPIE2, GPIE4, GPIE6, I2C10, I2C11, I2C12,
+              I2C13, I2C14, I2C3, I2C4, I2C5, I2C6, I2C7, I2C8, I2C9, LPCPD,
+              LPCPME, LPCRST, LPCSMI, MAC1LINK, MAC2LINK, MDIO1, MDIO2, NCTS1,
+              NCTS2, NCTS3, NCTS4, NDCD1, NDCD2, NDCD3, NDCD4, NDSR1, NDSR2,
+              NDSR3, NDSR4, NDTR1, NDTR2, NDTR3, NDTR4, NDTS4, NRI1, NRI2,
+              NRI3, NRI4, NRTS1, NRTS2, NRTS3, OSCCLK, PWM0, PWM1, PWM2, PWM3,
+              PWM4, PWM5, PWM6, PWM7, RGMII1, RGMII2, RMII1, RMII2, ROM16,
+              ROM8, ROMCS1, ROMCS2, ROMCS3, ROMCS4, RXD1, RXD2, RXD3, RXD4,
+              SALT1, SALT2, SALT3, SALT4, SD1, SD2, SGPMCK, SGPMI, SGPMLD,
+              SGPMO, SGPSCK, SGPSI0, SGPSI1, SGPSLD, SIOONCTRL, SIOPBI, SIOPBO,
+              SIOPWREQ, SIOPWRGD, SIOS3, SIOS5, SIOSCI, SPI1, SPI1DEBUG,
+              SPI1PASSTHRU, SPICS1, TIMER3, TIMER4, TIMER5, TIMER6, TIMER7,
+              TIMER8, TXD1, TXD2, TXD3, TXD4, UART6, USB11D1, USB11H2, USB2D1,
+              USB2H1, USBCKI, VGABIOS_ROM, VGAHS, VGAVS, VPI18, VPI24, VPI30,
+              VPO12, VPO24, WDTRST1, WDTRST2 ]
+
+required:
+  - compatible
+
+examples:
+  - |
+    syscon: scu@1e6e2000 {
+        compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
+        reg = <0x1e6e2000 0x1a8>;
+
+        pinctrl: pinctrl {
+            compatible = "aspeed,g4-pinctrl";
+
+            pinctrl_i2c3_default: i2c3_default {
+                function = "I2C3";
+                groups = "I2C3";
+            };
+
+            pinctrl_gpioh0_unbiased_default: gpioh0 {
+                pins = "A8";
+                bias-disable;
+            };
+        };
+    };