dt-bindings: rtc: isl12026: convert to YAML schema

Convert the ISL12026 RTC binding from text format to YAML schema.
Remove the legacy text binding.

The new schema enables dtbs_check validation.

Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260227185115.174997-1-piyushpatle228@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: PiyushPatle26

Documentation/devicetree/bindings/rtc/isil,isl12026.txt

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/isil,isl12026.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intersil ISL12026 I2C RTC/EEPROM
+
+maintainers:
+  - Piyush Patle <piyushpatle228@gmail.com>
+
+description:
+  The ISL12026 is a combination RTC and EEPROM device connected via I2C.
+  The RTC and control registers respond at address 0x6f, while the EEPROM
+  array responds at address 0x57. The "reg" property refers to the RTC
+  portion of the device.
+
+allOf:
+  - $ref: rtc.yaml#
+
+properties:
+  compatible:
+    const: isil,isl12026
+
+  reg:
+    maxItems: 1
+    description: I2C address of the RTC portion (must be 0x6f)
+
+  isil,pwr-bsw:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      Value written to the PWR.BSW bit for proper device operation.
+
+  isil,pwr-sbib:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    description:
+      Value written to the PWR.SBIB bit for proper device operation.
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@6f {
+            compatible = "isil,isl12026";
+            reg = <0x6f>;
+            isil,pwr-bsw = <0>;
+            isil,pwr-sbib = <1>;
+        };
+    };