dt-bindings: rtc: Move isil,isl12022 from trivial-rtc.yaml into own schema file

Move the isil,isl12022 RTC bindings from trivial-rtc.yaml into its own
intersil,isl12022.yaml file, in preparation for adding more bindings.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230615105826.411953-3-linux@rasmusvillemoes.dk
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/intersil,isl12022.yaml

@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/intersil,isl12022.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intersil ISL12022 Real-time Clock
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+properties:
+  compatible:
+    const: isil,isl12022
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: rtc.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@6f {
+            compatible = "isil,isl12022";
+            reg = <0x6f>;
+            interrupts-extended = <&gpio1 5 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };
+
+...

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

@@ -45,8 +45,6 @@ properties:
       - isil,isl1208
       # Intersil ISL1218 Low Power RTC with Battery Backed SRAM
       - isil,isl1218
-      # Intersil ISL12022 Real-time Clock
-      - isil,isl12022
       # Real Time Clock Module with I2C-Bus
       - microcrystal,rv3029
       # Real Time Clock