dt-bindings: timer: brcm,kona-timer: convert to YAML

Convert Broadcom Kona family timer bindings to DT schema.

Changes during conversion:
  - drop deprecated compatible (it's been deprecated for ~10 years)

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230618144635.GA22166@standask-GA-A55M-S2HP

Author: Stanislav Jakubek

Documentation/devicetree/bindings/timer/brcm,kona-timer.txt

@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/brcm,kona-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom Kona family timer
+
+maintainers:
+  - Florian Fainelli <f.fainelli@gmail.com>
+
+properties:
+  compatible:
+    const: brcm,kona-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-frequency: true
+
+oneOf:
+  - required:
+      - clocks
+  - required:
+      - clock-frequency
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/bcm281xx.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    timer@35006000 {
+        compatible = "brcm,kona-timer";
+        reg = <0x35006000 0x1000>;
+        interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&aon_ccu BCM281XX_AON_CCU_HUB_TIMER>;
+    };
+...