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+# SPDX-License-Identifier: GPL-2.0-or-later
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/aspeed,ast2500-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED AST2500 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,ast2500-scu", "syscon", "simple-mfd"
+  			"aspeed,g5-scu", "syscon", "simple-mfd"
+
+  Refer to the the bindings described in
+  Documentation/devicetree/bindings/mfd/syscon.txt
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2500-pinctrl
+      - aspeed,g5-pinctrl
+  aspeed,external-nodes:
+    minItems: 2
+    maxItems: 2
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      A cell of phandles to external controller nodes:
+      0: compatible with "aspeed,ast2500-gfx", "syscon"
+      1: compatible with "aspeed,ast2500-lhc", "syscon"
+
+patternProperties:
+  '^.*$':
+    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", "ESPI", "FWSPICS1",
+              "FWSPICS2", "GPID0", "GPID2", "GPID4", "GPID6", "GPIE0", "GPIE2",
+              "GPIE4", "GPIE6", "I2C10", "I2C11", "I2C12", "I2C13", "I2C14",
+              "I2C3", "I2C4", "I2C5", "I2C6", "I2C7", "I2C8", "I2C9", "LAD0",
+              "LAD1", "LAD2", "LAD3", "LCLK", "LFRAME", "LPCHC", "LPCPD",
+              "LPCPLUS", "LPCPME", "LPCRST", "LPCSMI", "LSIRQ", "MAC1LINK",
+              "MAC2LINK", "MDIO1", "MDIO2", "NCTS1", "NCTS2", "NCTS3", "NCTS4",
+              "NDCD1", "NDCD2", "NDCD3", "NDCD4", "NDSR1", "NDSR2", "NDSR3",
+              "NDSR4", "NDTR1", "NDTR2", "NDTR3", "NDTR4", "NRI1", "NRI2",
+              "NRI3", "NRI4", "NRTS1", "NRTS2", "NRTS3", "NRTS4", "OSCCLK",
+              "PEWAKE", "PNOR", "PWM0", "PWM1", "PWM2", "PWM3", "PWM4", "PWM5",
+              "PWM6", "PWM7", "RGMII1", "RGMII2", "RMII1", "RMII2", "RXD1",
+              "RXD2", "RXD3", "RXD4", "SALT1", "SALT10", "SALT11", "SALT12",
+              "SALT13", "SALT14", "SALT2", "SALT3", "SALT4", "SALT5", "SALT6",
+              "SALT7", "SALT8", "SALT9", "SCL1", "SCL2", "SD1", "SD2", "SDA1",
+              "SDA2", "SGPS1", "SGPS2", "SIOONCTRL", "SIOPBI", "SIOPBO",
+              "SIOPWREQ", "SIOPWRGD", "SIOS3", "SIOS5", "SIOSCI", "SPI1",
+              "SPI1CS1", "SPI1DEBUG", "SPI1PASSTHRU", "SPI2CK", "SPI2CS0",
+              "SPI2CS1", "SPI2MISO", "SPI2MOSI", "TIMER3", "TIMER4", "TIMER5",
+              "TIMER6", "TIMER7", "TIMER8", "TXD1", "TXD2", "TXD3", "TXD4",
+              "UART6", "USB11BHID", "USB2AD", "USB2AH", "USB2BD", "USB2BH",
+              "USBCKI", "VGABIOSROM", "VGAHS", "VGAVS", "VPI24", "VPO",
+              "WDTRST1", "WDTRST2", ]
+
+required:
+  - compatible
+  - aspeed,external-nodes
+
+examples:
+  - |
+    apb {
+        compatible = "simple-bus";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        syscon: scu@1e6e2000 {
+            compatible = "aspeed,ast2500-scu", "syscon", "simple-mfd";
+            reg = <0x1e6e2000 0x1a8>;
+
+            pinctrl: pinctrl {
+                compatible = "aspeed,g5-pinctrl";
+                aspeed,external-nodes = <&gfx>, <&lhc>;
+
+                pinctrl_i2c3_default: i2c3_default {
+                    function = "I2C3";
+                    groups = "I2C3";
+                };
+
+                pinctrl_gpioh0_unbiased_default: gpioh0 {
+                    pins = "A18";
+                    bias-disable;
+                };
+            };
+        };
+
+        gfx: display@1e6e6000 {
+            compatible = "aspeed,ast2500-gfx", "syscon";
+            reg = <0x1e6e6000 0x1000>;
+        };
+    };
+
+    lpc: lpc@1e789000 {
+        compatible = "aspeed,ast2500-lpc", "simple-mfd";
+        reg = <0x1e789000 0x1000>;
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0x1e789000 0x1000>;
+
+        lpc_host: lpc-host@80 {
+            compatible = "aspeed,ast2500-lpc-host", "simple-mfd", "syscon";
+            reg = <0x80 0x1e0>;
+            reg-io-width = <4>;
+
+            #address-cells = <1>;
+            #size-cells = <1>;
+            ranges = <0x0 0x80 0x1e0>;
+
+            lhc: lhc@20 {
+                   compatible = "aspeed,ast2500-lhc";
+                   reg = <0x20 0x24 0x48 0x8>;
+            };
+        };
+    };