dt-bindings: rng: Convert i.MX to json-schema

Convert the i.MX rng binding to DT schema format using json-schema.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1596608884-13205-1-git-send-email-Anson.Huang@nxp.com
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/rng/imx-rng.txt

@@ -1,23 +0,0 @@
-Freescale RNGA/RNGB/RNGC (Random Number Generator Versions A, B and C)
-
-Required properties:
-- compatible : should be one of
-               "fsl,imx21-rnga"
-               "fsl,imx31-rnga" (backward compatible with "fsl,imx21-rnga")
-               "fsl,imx25-rngb"
-               "fsl,imx6sl-rngb" (backward compatible with "fsl,imx25-rngb")
-               "fsl,imx6sll-rngb" (backward compatible with "fsl,imx25-rngb")
-               "fsl,imx6ull-rngb" (backward compatible with "fsl,imx25-rngb")
-               "fsl,imx35-rngc"
-- reg : offset and length of the register set of this block
-- interrupts : the interrupt number for the RNG block
-- clocks : the RNG clk source
-
-Example:
-
-rng@53fb0000 {
-	compatible = "fsl,imx25-rngb";
-	reg = <0x53fb0000 0x4000>;
-	interrupts = <22>;
-	clocks = <&trng_clk>;
-};

Documentation/devicetree/bindings/rng/imx-rng.yaml

@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rng/imx-rng.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale RNGA/RNGB/RNGC (Random Number Generator Versions A, B and C)
+
+maintainers:
+  - Vladimir Zapolskiy <vz@mleia.com>
+
+properties:
+  compatible:
+    oneOf:
+      - const: fsl,imx21-rnga
+      - const: fsl,imx25-rngb
+      - items:
+          - const: fsl,imx31-rnga
+          - const: fsl,imx21-rnga
+      - items:
+          - enum:
+            - fsl,imx6sl-rngb
+            - fsl,imx6sll-rngb
+            - fsl,imx6ull-rngb
+          - const: fsl,imx25-rngb
+      - const: fsl,imx35-rngc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    rngb@53fb0000 {
+        compatible = "fsl,imx25-rngb";
+        reg = <0x53fb0000 0x4000>;
+        clocks = <&clks 109>;
+        interrupts = <22>;
+    };