dt-bindings: rtc: Convert rtc-fsl-ftm-alarm.txt to yaml format

Convert dt-binding doc "rtc-fsl-ftm-alarm.txt" to yaml format.

Change example's reg to 32bit address and length.
Remove unrelated rcpm@1e34040 in example.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240528184359.2685109-1-Frank.Li@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/fsl,ls-ftm-alarm.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/fsl,ls-ftm-alarm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale FlexTimer Module (FTM) Alarm
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    enum:
+      - fsl,ls1012a-ftm-alarm
+      - fsl,ls1021a-ftm-alarm
+      - fsl,ls1028a-ftm-alarm
+      - fsl,ls1043a-ftm-alarm
+      - fsl,ls1046a-ftm-alarm
+      - fsl,ls1088a-ftm-alarm
+      - fsl,ls208xa-ftm-alarm
+      - fsl,lx2160a-ftm-alarm
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  fsl,rcpm-wakeup:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to rcpm node
+          - description: bit mask of IPPDEXPCR0
+          - description: bit mask of IPPDEXPCR1
+          - description: bit mask of IPPDEXPCR2
+          - description: bit mask of IPPDEXPCR3
+          - description: bit mask of IPPDEXPCR4
+          - description: bit mask of IPPDEXPCR5
+          - description: bit mask of IPPDEXPCR6
+        minItems: 1
+    description:
+      phandle to rcpm node, Please refer
+      Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+
+  big-endian:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      If the host controller is big-endian mode, specify this property.
+      The default endian mode is little-endian.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - fsl,rcpm-wakeup
+
+allOf:
+  - $ref: rtc.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    rtc@2800000 {
+        compatible = "fsl,ls1088a-ftm-alarm";
+        reg = <0x2800000 0x10000>;
+        fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
+        interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
+    };

Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt

-Freescale FlexTimer Module (FTM) Alarm
-
-Required properties:
-- compatible : Should be "fsl,<chip>-ftm-alarm", the
-	       supported chips include
-	       "fsl,ls1012a-ftm-alarm"
-	       "fsl,ls1021a-ftm-alarm"
-	       "fsl,ls1028a-ftm-alarm"
-	       "fsl,ls1043a-ftm-alarm"
-	       "fsl,ls1046a-ftm-alarm"
-	       "fsl,ls1088a-ftm-alarm"
-	       "fsl,ls208xa-ftm-alarm"
-	       "fsl,lx2160a-ftm-alarm"
-- reg : Specifies base physical address and size of the register sets for the
-  FlexTimer Module.
-- interrupts : Should be the FlexTimer Module interrupt.
-- fsl,rcpm-wakeup property and rcpm node : Please refer
-	Documentation/devicetree/bindings/soc/fsl/rcpm.txt
-
-Optional properties:
-- big-endian: If the host controller is big-endian mode, specify this property.
-  The default endian mode is little-endian.
-
-Example:
-rcpm: rcpm@1e34040 {
-	compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+";
-	reg = <0x0 0x1e34040 0x0 0x18>;
-	#fsl,rcpm-wakeup-cells = <6>;
-};
-
-ftm_alarm0: timer@2800000 {
-	compatible = "fsl,ls1088a-ftm-alarm";
-	reg = <0x0 0x2800000 0x0 0x10000>;
-	fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
-	interrupts = <0 44 4>;
-};