dt-bindings: reset: nuvoton,npcm-reset: Convert to yaml

Convert the device tree bindings for the Nuvoton NPCM reset controller
to YAML schema to allow participating in DT validation.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Avi Fishman <avifishman70@gmail.com>
Cc: Tomer Maimon <tmaimon77@gmail.com>
Cc: Tali Perry <tali.perry1@gmail.com>
Cc: Patrick Venture <venture@google.com>
Cc: Nancy Yuen <yuenn@google.com>
Cc: Benjamin Fair <benjaminfair@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220407154338.4190674-6-p.zabel@pengutronix.de

Documentation/devicetree/bindings/reset/nuvoton,npcm-reset.txt

-Nuvoton NPCM Reset controller
-
-Required properties:
-- compatible : "nuvoton,npcm750-reset" for NPCM7XX BMC
-- reg : specifies physical base address and size of the register.
-- #reset-cells: must be set to 2
-
-Optional property:
-- nuvoton,sw-reset-number - Contains the software reset number to restart the SoC.
-  NPCM7xx contain four software reset that represent numbers 1 to 4.
-
-  If 'nuvoton,sw-reset-number' is not specified software reset is disabled.
-
-Example:
-	rstc: rstc@f0801000 {
-		compatible = "nuvoton,npcm750-reset";
-		reg = <0xf0801000 0x70>;
-		#reset-cells = <2>;
-		nuvoton,sw-reset-number = <2>;
-	};
-
-Specifying reset lines connected to IP NPCM7XX modules
-======================================================
-example:
-
-        spi0: spi@..... {
-                ...
-                resets = <&rstc NPCM7XX_RESET_IPSRST2 NPCM7XX_RESET_PSPI1>;
-                ...
-        };
-
-The index could be found in <dt-bindings/reset/nuvoton,npcm7xx-reset.h>.

Documentation/devicetree/bindings/reset/nuvoton,npcm750-reset.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/nuvoton,npcm750-reset.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NPCM Reset controller
+
+maintainers:
+  - Tomer Maimon <tmaimon77@gmail.com>
+
+properties:
+  compatible:
+    const: nuvoton,npcm750-reset
+
+  reg:
+    maxItems: 1
+
+  '#reset-cells':
+    const: 2
+
+  nuvoton,sw-reset-number:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 4
+    description: |
+      Contains the software reset number to restart the SoC.
+      If not specified, software reset is disabled.
+
+required:
+  - compatible
+  - reg
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/reset/nuvoton,npcm7xx-reset.h>
+    rstc: rstc@f0801000 {
+        compatible = "nuvoton,npcm750-reset";
+        reg = <0xf0801000 0x70>;
+        #reset-cells = <2>;
+        nuvoton,sw-reset-number = <2>;
+    };
+
+    // Specifying reset lines connected to IP NPCM7XX modules
+    spi0: spi {
+        resets = <&rstc NPCM7XX_RESET_IPSRST2 NPCM7XX_RESET_PSPI1>;
+    };