dt-bindings: reset: ath79: Convert to yaml

Convert the device tree bindings for the Qualcomm Atheros AR7xxx/AR9XXX
reset controller to YAML schema to allow participating in DT validation.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Alban Bedel <albeu@free.fr>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220407154338.4190674-2-p.zabel@pengutronix.de

Documentation/devicetree/bindings/reset/ath79-reset.txt

@@ -1,20 +0,0 @@
-Binding for Qualcomm Atheros AR7xxx/AR9XXX reset controller
-
-Please also refer to reset.txt in this directory for common reset
-controller binding usage.
-
-Required Properties:
-- compatible: has to be "qca,<soctype>-reset", "qca,ar7100-reset"
-              as fallback
-- reg: Base address and size of the controllers memory area
-- #reset-cells : Specifies the number of cells needed to encode reset
-                 line, should be 1
-
-Example:
-
-	reset-controller@1806001c {
-		compatible = "qca,ar9132-reset", "qca,ar7100-reset";
-		reg = <0x1806001c 0x4>;
-
-		#reset-cells = <1>;
-	};

Documentation/devicetree/bindings/reset/qca,ar7100-reset.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2015 Alban Bedel <albeu@free.fr>
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/reset/qca,ar7100-reset.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm Atheros AR7xxx/AR9XXX reset controller
+
+maintainers:
+  - Alban Bedel <albeu@free.fr>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qca,ar9132-reset
+          - qca,ar9331-reset
+      - const: qca,ar7100-reset
+
+  reg:
+    maxItems: 1
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    reset-controller@1806001c {
+          compatible = "qca,ar9132-reset", "qca,ar7100-reset";
+          reg = <0x1806001c 0x4>;
+          #reset-cells = <1>;
+    };