dt-bindings: pwm: vt8500-pwm: Convert to YAML

Rewrite the textual description for the WonderMedia PWM controller
as YAML schema, and switch the filename to follow the compatible
string.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250418-via_pwm_binding-v2-1-17545f4d719e@gmail.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Documentation/devicetree/bindings/pwm/via,vt8500-pwm.yaml

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/via,vt8500-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller
+
+maintainers:
+  - Alexey Charkov <alchark@gmail.com>
+
+allOf:
+  - $ref: pwm.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: via,vt8500-pwm
+
+  reg:
+    maxItems: 1
+
+  '#pwm-cells':
+    const: 3
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    pwm1: pwm@d8220000 {
+        compatible = "via,vt8500-pwm";
+        reg = <0xd8220000 0x1000>;
+        #pwm-cells = <3>;
+        clocks = <&clkpwm>;
+    };

Documentation/devicetree/bindings/pwm/vt8500-pwm.txt

@@ -1,18 +0,0 @@
-VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller
-
-Required properties:
-- compatible: should be "via,vt8500-pwm"
-- reg: physical base address and length of the controller's registers
-- #pwm-cells: should be 3. See pwm.yaml in this directory for a description of
-  the cells format. The only third cell flag supported by this binding is
-  PWM_POLARITY_INVERTED.
-- clocks: phandle to the PWM source clock
-
-Example:
-
-pwm1: pwm@d8220000 {
-	#pwm-cells = <3>;
-	compatible = "via,vt8500-pwm";
-	reg = <0xd8220000 0x1000>;
-	clocks = <&clkpwm>;
-};

MAINTAINERS

@@ -3428,6 +3428,7 @@ M:	Krzysztof Kozlowski <krzk@kernel.org>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Odd Fixes
 F:	Documentation/devicetree/bindings/i2c/i2c-wmt.txt
+F:	Documentation/devicetree/bindings/pwm/via,vt8500-pwm.yaml
 F:	arch/arm/boot/dts/vt8500/
 F:	arch/arm/mach-vt8500/
 F:	drivers/clocksource/timer-vt8500.c