dt-bindings: ata: Convert apm,xgene-ahci to DT schema

Convert the APM X-Gene AHCI SATA Controller to DT schema format. It's a
straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

Author: robherring

Documentation/devicetree/bindings/ata/apm,xgene-ahci.yaml

@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ata/apm,xgene-ahci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: APM X-Gene 6.0 Gb/s SATA host controller
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+allOf:
+  - $ref: ahci-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - apm,xgene-ahci
+      - apm,xgene-ahci-pcie
+
+  reg:
+    minItems: 4
+    items:
+      - description: AHCI memory resource
+      - description: Host controller core
+      - description: Host controller diagnostic
+      - description: Host controller AXI
+      - description: Host controller MUX
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - clocks
+  - phys
+  - phy-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    sata@1a400000 {
+        compatible = "apm,xgene-ahci";
+        reg = <0x1a400000 0x1000>,
+              <0x1f220000 0x1000>,
+              <0x1f22d000 0x1000>,
+              <0x1f22e000 0x1000>,
+              <0x1f227000 0x1000>;
+        clocks = <&sataclk 0>;
+        dma-coherent;
+        interrupts = <0x0 0x87 0x4>;
+        phys = <&phy2 0>;
+        phy-names = "sata-phy";
+    };