dt-bindings: rtc: Move rv3028 from trivial-rtc.yaml into own schema file

Move RV3028 RTC bindings from trivial-rtc.yaml into microcrystal,rv3032.yaml.
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230111163404.3526248-2-w.egorov@phytec.deSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/microcrystal,rv3028.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip RV-3028 RTC
+
+allOf:
+  - $ref: rtc.yaml#
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+properties:
+  compatible:
+    const: microcrystal,rv3028
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  trickle-resistor-ohms:
+    enum:
+      - 3000
+      - 5000
+      - 9000
+      - 15000
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@51 {
+            compatible = "microcrystal,rv3028";
+            reg = <0x51>;
+            pinctrl-0 = <&rtc_nint_pins>;
+            interrupts-extended = <&gpio1 16 IRQ_TYPE_LEVEL_HIGH>;
+            trickle-resistor-ohms = <3000>;
+        };
+    };
+
+...

Documentation/devicetree/bindings/rtc/trivial-rtc.yaml

@@ -50,8 +50,6 @@ properties:
       # Loongson-2K Socs/LS7A bridge Real-time Clock
       - loongson,ls2x-rtc
       # Real Time Clock Module with I2C-Bus
-      - microcrystal,rv3028
-      # Real Time Clock Module with I2C-Bus
       - microcrystal,rv3029
       # Real Time Clock
       - microcrystal,rv8523