dt-bindings: pinctrl: convert Broadcom Northstar to the json-schema

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,bcm4708-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,bcm4708-pinmux.txt
deleted file mode 100644
index 8ab2d468dbdb..000000000000
--- a/Documentation/devicetree/bindings/pinctrl/brcm,bcm4708-pinmux.txt
+++ /dev/null
@@ -1,55 +0,0 @@ 
-Broadcom Northstar pins mux controller
-
-Some of Northstar SoCs's pins can be used for various purposes thanks to the mux
-controller. This binding allows describing mux controller and listing available
-functions. They can be referenced later by other bindings to let system
-configure controller correctly.
-
-A list of pins varies across chipsets so few bindings are available.
-
-Node of the pinmux must be nested in the CRU (Central Resource Unit) "syscon"
-noce.
-
-Required properties:
-- compatible: must be one of:
-	"brcm,bcm4708-pinmux"
-	"brcm,bcm4709-pinmux"
-	"brcm,bcm53012-pinmux"
-- offset: offset of pin registers in the CRU block
-
-Functions and their groups available for all chipsets:
-- "spi": "spi_grp"
-- "i2c": "i2c_grp"
-- "pwm": "pwm0_grp", "pwm1_grp", "pwm2_grp", "pwm3_grp"
-- "uart1": "uart1_grp"
-
-Additionally available on BCM4709 and BCM53012:
-- "mdio": "mdio_grp"
-- "uart2": "uart2_grp"
-- "sdio": "sdio_pwr_grp", "sdio_1p8v_grp"
-
-For documentation of subnodes see:
-Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-
-Example:
-	dmu@1800c000 {
-		compatible = "simple-bus";
-		ranges = <0 0x1800c000 0x1000>;
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		cru@100 {
-			compatible = "syscon", "simple-mfd";
-			reg = <0x100 0x1a4>;
-
-			pinctrl {
-				compatible = "brcm,bcm4708-pinmux";
-				offset = <0xc0>;
-
-				spi-pins {
-					function = "spi";
-					groups = "spi_grp";
-				};
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.yaml
new file mode 100644
index 000000000000..1cba8f0db5c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.yaml
@@ -0,0 +1,98 @@ 
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/brcm,ns-pinmux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom Northstar pins mux controller
+
+maintainers:
+  - Rafał Miłecki <rafal@milecki.pl>
+
+description:
+  Some of Northstar SoCs's pins can be used for various purposes thanks to the
+  mux controller. This binding allows describing mux controller and listing
+  available functions. They can be referenced later by other bindings to let
+  system configure controller correctly.
+
+  A list of pins varies across chipsets so few bindings are available.
+
+  Node of the pinmux must be nested in the CRU (Central Resource Unit) "syscon"
+  node.
+
+properties:
+  compatible:
+    enum:
+      - brcm,bcm4708-pinmux
+      - brcm,bcm4709-pinmux
+      - brcm,bcm53012-pinmux
+
+  offset:
+    description: offset of pin registers in the CRU block
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+
+patternProperties:
+  '-pins$':
+    type: object
+    description: pin node
+    $ref: pinmux-node.yaml#
+
+    properties:
+      function:
+        enum: [ spi, i2c, pwm, uart1, mdio, uart2, sdio ]
+      groups:
+        items:
+          enum: [ spi_grp, i2c_grp, pwm0_grp, pwm1_grp, pwm2_grp, pwm3_grp,
+                  uart1_grp, mdio_grp, uart2_grp, sdio_pwr_grp, sdio_1p8v_grp ]
+
+    required:
+      - function
+      - groups
+
+    additionalProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: brcm,bcm4708-pinmux
+    then:
+      patternProperties:
+        '-pins$':
+          properties:
+            function:
+              enum: [ spi, i2c, pwm, uart1 ]
+            groups:
+              items:
+                enum: [ spi_grp, i2c_grp, pwm0_grp, pwm1_grp, pwm2_grp, pwm3_grp,
+                        uart1_grp ]
+
+required:
+  - offset
+
+additionalProperties: false
+
+examples:
+  - |
+    dmu@1800c000 {
+        compatible = "simple-bus";
+        ranges = <0 0x1800c000 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        cru@100 {
+            compatible = "syscon", "simple-mfd";
+            reg = <0x100 0x1a4>;
+
+            pinctrl {
+                compatible = "brcm,bcm4708-pinmux";
+                offset = <0xc0>;
+
+                spi-pins {
+                    function = "spi";
+                    groups = "spi_grp";
+                };
+            };
+        };
+    };