[PATCH v4] dt-bindings: serial: actions,owl-uart: convert to dtschema

[Kanak Shilledar <kanakshilledar@gmail.com>]

From: Kanak Shilledar <kanakshilledar111@protonmail.com>

Convert the Actions Semi Owl UART to newer DT schema.
Created DT schema based on the .txt file which had
`compatible`, `reg` and `interrupts` as the
required properties. This binding is used by Actions S500, S700
and S900 SoC. S700 and S900 use the same UART compatible string.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kanak Shilledar <kanakshilledar111@protonmail.com>
---
Changes in v4
- added `clocks` property to fix warning of 'clocks' was unexpected
while running `make dtbs_check`. `clocks` property was not defined
in the original .txt file. `clocks` property is removed from the
required section.
- added `clocks` property in example
- extended the devicetree with clocks node
---
 .../bindings/serial/actions,owl-uart.txt      | 16 -------
 .../bindings/serial/actions,owl-uart.yaml     | 48 +++++++++++++++++++
 2 files changed, 48 insertions(+), 16 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/serial/actions,owl-uart.txt
 create mode 100644 Documentation/devicetree/bindings/serial/actions,owl-uart.yaml

diff --git a/Documentation/devicetree/bindings/serial/actions,owl-uart.txt b/Documentation/devicetree/bindings/serial/actions,owl-uart.txt
deleted file mode 100644
index aa873eada02d..000000000000
--- a/Documentation/devicetree/bindings/serial/actions,owl-uart.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-Actions Semi Owl UART
-
-Required properties:
-- compatible :  "actions,s500-uart", "actions,owl-uart" for S500
-                "actions,s900-uart", "actions,owl-uart" for S900
-- reg        :  Offset and length of the register set for the device.
-- interrupts :  Should contain UART interrupt.
-
-
-Example:
-
-		uart3: serial@b0126000 {
-			compatible = "actions,s500-uart", "actions,owl-uart";
-			reg = <0xb0126000 0x1000>;
-			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
-		};
diff --git a/Documentation/devicetree/bindings/serial/actions,owl-uart.yaml b/Documentation/devicetree/bindings/serial/actions,owl-uart.yaml
new file mode 100644
index 000000000000..ab1c4514ae93
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/actions,owl-uart.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/actions,owl-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Actions Semi Owl UART
+
+maintainers:
+  - Kanak Shilledar <kanakshilledar111@protonmail.com>
+
+allOf:
+  - $ref: serial.yaml
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - actions,s500-uart
+          - actions,s900-uart
+      - const: actions,owl-uart
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/actions,s500-cmu.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    uart0: serial@b0126000 {
+        compatible = "actions,s500-uart", "actions,owl-uart";
+        reg = <0xb0126000 0x1000>;
+        clocks = <&cmu CLK_UART0>;
+        interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+    };
-- 
2.34.1