[PATCH] dt-bindings: pwm: Convert lpc32xx-pwm.txt to YAML schema

[Purva Yeshi <purvayeshi550@gmail.com>]

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Convert the existing `lpc32xx-pwm.txt` bindings documentation into a
YAML schema (`lpc32xx-pwm.yaml`).

Changes:

Add SPDX license identifier `(GPL-2.0-only OR BSD-2-Clause)`.
Define `$id` and `$schema` fields for proper schema validation.
Set `title` to describe the LPC32XX PWM controller.
Add maintainers as per `scripts/get_maintainer.pl` output.
Reference `pwm.yaml#` in `allOf` to inherit common PWM properties.

Define properties:
Restrict `compatible` to `"nxp,lpc3220-pwm"` using `const`.
Limit `reg` to `maxItems: 1` to ensure a single register range.
Set `"#pwm-cells"` to `const: 3` for expected PWM cell properties.

Mark `compatible` and `reg` as required properties.
Set `unevaluatedProperties: false` to enforce strict validation.

Validate the YAML schema using dt-validate and yamllint.

Signed-off-by: Purva Yeshi <purvayeshi550@gmail.com>
---
 .../devicetree/bindings/pwm/lpc32xx-pwm.yaml  | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/lpc32xx-pwm.yaml

diff --git a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.yaml b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.yaml
new file mode 100644
index 000000000..3e41cd291
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/nxp,lpc32xx-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LPC32XX PWM controller
+
+maintainers:
+  - "Uwe Kleine-König <ukleinek@kernel.org>"
+  - "Vladimir Zapolskiy <vz@mleia.com>"
+  - "Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>"
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    const: nxp,lpc3220-pwm
+
+  reg:
+    maxItems: 1
+
+  "#pwm-cells":
+    const: 3
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    pwm@4005c000 {
+        compatible = "nxp,lpc3220-pwm";
+        reg = <0x4005c000 0x4>;
+        #pwm-cells = <3>;
+    };
+  - |
+    pwm@4005c004 {
+        compatible = "nxp,lpc3220-pwm";
+        reg = <0x4005c004 0x4>;
+        #pwm-cells = <3>;
+    };
-- 
2.34.1