dt-bindings: mtd: Document ARASAN NAND bindings

Document the Arasan NAND controller bindings.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20200519074549.23673-7-miquel.raynal@bootlin.com

Documentation/devicetree/bindings/mtd/arasan,nand-controller.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/arasan,nand-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arasan NAND Flash Controller with ONFI 3.1 support device tree bindings
+
+allOf:
+  - $ref: "nand-controller.yaml"
+
+maintainers:
+  - Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+        - enum:
+          - xlnx,zynqmp-nand-controller
+        - enum:
+          - arasan,nfc-v3p10
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Controller clock
+      - description: NAND bus clock
+
+  clock-names:
+    items:
+      - const: controller
+      - const: bus
+
+  interrupts:
+    maxItems: 1
+
+  "#address-cells": true
+  "#size-cells": true
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+additionalProperties: true
+
+examples:
+  - |
+    nfc: nand-controller@ff100000 {
+        compatible = "xlnx,zynqmp-nand-controller", "arasan,nfc-v3p10";
+        reg = <0x0 0xff100000 0x0 0x1000>;
+        clock-names = "controller", "bus";
+        clocks = <&clk200>, <&clk100>;
+        interrupt-parent = <&gic>;
+        interrupts = <0 14 4>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };