dt-bindings: clock: actions,owl-cmu: convert to YAML

Convert the Actions Semi Owl CMU bindings to DT schema.

Changes during conversion:
- Since all Actions Semi Owl SoCs utilize the internal low frequency
oscillator as a parent for some clocks, require it.

Signed-off-by: Ivaylo Ivanov <[e-mail]>
Reviewed-by: Conor Dooley <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Manivannan Sadhasivam <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/actions,owl-cmu.txt

···
-* Actions Semi Owl Clock Management Unit (CMU)
-
-The Actions Semi Owl Clock Management Unit generates and supplies clock
-to various controllers within the SoC. The clock binding described here is
-applicable to S900, S700 and S500 SoC's.
-
-Required Properties:
-
-- compatible: should be one of the following,
-	"actions,s900-cmu"
-	"actions,s700-cmu"
-	"actions,s500-cmu"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- clocks: Reference to the parent clocks ("hosc", "losc")
-- #clock-cells: should be 1.
-- #reset-cells: should be 1.
-
-Each clock is assigned an identifier, and client nodes can use this identifier
-to specify the clock which they consume.
-
-All available clocks are defined as preprocessor macros in corresponding
-dt-bindings/clock/actions,s900-cmu.h or actions,s700-cmu.h or
-actions,s500-cmu.h header and can be used in device tree sources.
-
-External clocks:
-
-The hosc clock used as input for the plls is generated outside the SoC. It is
-expected that it is defined using standard clock bindings as "hosc".
-
-Actions Semi S900 CMU also requires one more clock:
- - "losc" - internal low frequency oscillator
-
-Example: Clock Management Unit node:
-
-        cmu: clock-controller@e0160000 {
-                compatible = "actions,s900-cmu";
-                reg = <0x0 0xe0160000 0x0 0x1000>;
-                clocks = <&hosc>, <&losc>;
-                #clock-cells = <1>;
-                #reset-cells = <1>;
-        };
-
-Example: UART controller node that consumes clock generated by the clock
-management unit:
-
-        uart: serial@e012a000 {
-                compatible = "actions,s900-uart", "actions,owl-uart";
-                reg = <0x0 0xe012a000 0x0 0x2000>;
-                interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
-                clocks = <&cmu CLK_UART5>;
-        };

Documentation/devicetree/bindings/clock/actions,owl-cmu.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/actions,owl-cmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Actions Semi Owl Clock Management Unit (CMU)
+
+maintainers:
+  - Manivannan Sadhasivam <[e-mail]>
+
+description: |
+  The Actions Semi Owl Clock Management Unit generates and supplies clock
+  to various controllers within the SoC.
+
+  See also:
+    include/dt-bindings/clock/actions,s500-cmu.h
+    include/dt-bindings/clock/actions,s700-cmu.h
+    include/dt-bindings/clock/actions,s900-cmu.h
+
+properties:
+  compatible:
+    enum:
+      - actions,s500-cmu
+      - actions,s700-cmu
+      - actions,s900-cmu
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Host oscillator source
+      - description: Internal low frequency oscillator source
+
+  "#clock-cells":
+    const: 1
+
+  "#reset-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - "#clock-cells"
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@e0160000 {
+        compatible = "actions,s900-cmu";
+        reg = <0xe0160000 0x1000>;
+        clocks = <&hosc>, <&losc>;
+        #clock-cells = <1>;
+        #reset-cells = <1>;
+    };
+...

MAINTAINERS

···
 L:	[e-mail] (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/devicetree/bindings/arm/actions.yaml
-F:	Documentation/devicetree/bindings/clock/actions,owl-cmu.txt
+F:	Documentation/devicetree/bindings/clock/actions,owl-cmu.yaml
 F:	Documentation/devicetree/bindings/dma/owl-dma.yaml
 F:	Documentation/devicetree/bindings/i2c/i2c-owl.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.yaml