dt-bindings: arm: rockchip: convert pmu.txt to YAML

Current dts files with 'pmu' nodes are manually verified.
In order to automate this process pmu.txt
has to be converted to yaml.
Signed-off-by: NJohan Jonker <jbx6244@gmail.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210417112952.8516-12-jbx6244@gmail.comSigned-off-by: NHeiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip/pmu.txt

-Rockchip power-management-unit:
--------------------------------
-
-The pmu is used to turn off and on different power domains of the SoCs
-This includes the power to the CPU cores.
-
-Required node properties:
-- compatible value : = "rockchip,rk3066-pmu";
-- reg : physical base address and the size of the registers window
-
-Example:
-
-	pmu@20004000 {
-		compatible = "rockchip,rk3066-pmu";
-		reg = <0x20004000 0x100>;
-	};

Documentation/devicetree/bindings/arm/rockchip/pmu.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/rockchip/pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip Power Management Unit (PMU)
+
+maintainers:
+  - Elaine Zhang <zhangqing@rock-chips.com>
+  - Heiko Stuebner <heiko@sntech.de>
+
+description: |
+  The PMU is used to turn on and off different power domains of the SoCs.
+  This includes the power to the CPU cores.
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - rockchip,rk3066-pmu
+
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - rockchip,rk3066-pmu
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: true
+
+examples:
+  - |
+    pmu@20004000 {
+      compatible = "rockchip,rk3066-pmu", "syscon", "simple-mfd";
+      reg = <0x20004000 0x100>;
+    };