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diff --git a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2500-pinctrl.yaml
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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 bindings described in
+  Documentation/devicetree/bindings/mfd/syscon.yaml
+
+properties:
+  compatible:
+    const: aspeed,ast2500-pinctrl
+  reg:
+    maxItems: 2
+
+  aspeed,external-nodes:
+    minItems: 2
+    maxItems: 2
+    items:
+      maxItems: 1
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      A cell of phandles to external controller nodes:
+      0: compatible with "aspeed,ast2500-gfx", "syscon"
+      1: compatible with "aspeed,ast2500-lhc", "syscon"
+
+patternProperties:
+  '^.*$':
+    if:
+      type: object
+    then:
+      patternProperties:
+        "^function|groups$":
+          $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]
+
+allOf:
+  - $ref: "pinctrl.yaml#"
+
+required:
+  - compatible
+  - aspeed,external-nodes
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    scu@1e6e2000 {
+        compatible = "aspeed,ast2500-scu", "syscon", "simple-mfd";
+        reg = <0x1e6e2000 0x1a8>;
+        #clock-cells = <1>;
+        #reset-cells = <1>;
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0x1e6e2000 0x1000>;
+
+        pinctrl: pinctrl {
+            compatible = "aspeed,ast2500-pinctrl";
+            aspeed,external-nodes = <&gfx>, <&lhc>;
+
+            pinctrl_i2c3_default: i2c3_default {
+                function = "I2C3";
+                groups = "I2C3";
+            };
+
+            pinctrl_gpioh0_unbiased_default: gpioh0 {
+                pins = "A18";
+                bias-disable;
+            };
+        };
+    };