dt-bindings: arm: tegra: ahb: Convert to json-schema

Convert the NVIDIA Tegra AHB bindings from the free-form text format to
json-schema.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-ahb.txt

-NVIDIA Tegra AHB
-
-Required properties:
-- compatible : For Tegra20, must contain "nvidia,tegra20-ahb".  For
-  Tegra30, must contain "nvidia,tegra30-ahb".  Otherwise, must contain
-  '"nvidia,<chip>-ahb", "nvidia,tegra30-ahb"' where <chip> is tegra124,
-  tegra132, or tegra210.
-- reg : Should contain 1 register ranges(address and length).  For
-  Tegra20, Tegra30, and Tegra114 chips, the value must be <0x6000c004
-  0x10c>.  For Tegra124, Tegra132 and Tegra210 chips, the value should
-  be be <0x6000c000 0x150>.
-
-Example (for a Tegra20 chip):
-	ahb: ahb@6000c004 {
-		compatible = "nvidia,tegra20-ahb";
-		reg = <0x6000c004 0x10c>; /* AHB Arbitration + Gizmo Controller */
-	};

Documentation/devicetree/bindings/soc/tegra/nvidia,tegra20-ahb.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/tegra/nvidia,tegra20-ahb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+maintainers:
+  - Thierry Reding <thierry.reding@gmail.com>
+  - Jon Hunter <jonathanh@nvidia.com>
+
+title: NVIDIA Tegra AHB
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - nvidia,tegra20-ahb
+          - nvidia,tegra30-ahb
+      - items:
+          - enum:
+              - nvidia,tegra114-ahb
+              - nvidia,tegra124-ahb
+              - nvidia,tegra210-ahb
+          - const: nvidia,tegra30-ahb
+
+  reg:
+    maxItems: 1
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    ahb@6000c004 {
+        compatible = "nvidia,tegra20-ahb";
+        reg = <0x6000c004 0x10c>; /* AHB Arbitration + Gizmo Controller */
+    };