dt-bindings: mtd: Add Samsung S5Pv210 OneNAND

Document binding for Samsung S5Pv210 SoC OneNAND controller used already
in S5Pv210 DTS.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

Documentation/devicetree/bindings/mtd/samsung,s5pv210-onenand.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/samsung,s5pv210-onenand.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung S5Pv210 SoC OneNAND Controller
+
+maintainers:
+  - Krzysztof Kozlowski <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - samsung,s5pv210-onenand
+
+  reg:
+    items:
+      - description: Control registers
+      - description: OneNAND interface nCE[0]
+      - description: OneNAND interface nCE[1]
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: bus
+      - const: onenand
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+
+allOf:
+  - $ref: nand-controller.yaml
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/s5pv210.h>
+
+    nand-controller@b0600000 {
+        compatible = "samsung,s5pv210-onenand";
+        reg = <0xb0600000 0x2000>,
+              <0xb0000000 0x20000>,
+              <0xb0040000 0x20000>;
+        clocks = <&clocks CLK_NANDXL>, <&clocks DOUT_FLASH>;
+        clock-names = "bus", "onenand";
+        interrupt-parent = <&vic1>;
+        interrupts = <31>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        nand@0 {
+            reg = <0>;
+        };
+    };