dt-bindings: mtd: Add ts7200 nand-controller

Add YAML bindings for ts7200 NAND Controller.

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/mtd/technologic,nand.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/technologic,nand.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Technologic Systems NAND controller
+
+maintainers:
+  - Nikita Shubin <nikita.shubin@maquefel.me>
+
+allOf:
+  - $ref: nand-controller.yaml
+
+properties:
+  compatible:
+    oneOf:
+      - const: technologic,ts7200-nand
+      - items:
+          - enum:
+              - technologic,ts7300-nand
+              - technologic,ts7260-nand
+              - technologic,ts7250-nand
+          - const: technologic,ts7200-nand
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    nand-controller@60000000 {
+        compatible = "technologic,ts7200-nand";
+        reg = <0x60000000 0x8000000>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        nand@0 {
+           reg = <0>;
+        };
+    };