dt-bindings: ata: Convert ti,dm816-ahci to DT schema

Convert the TI DM816 AHCI SATA Controller to DT schema format. It's a
straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>

Documentation/devicetree/bindings/ata/ahci-dm816.txt

···
-Device tree binding for the TI DM816 AHCI SATA Controller
----------------------------------------------------------
-
-Required properties:
-  - compatible: must be "ti,dm816-ahci"
-  - reg: physical base address and size of the register region used by
-         the controller (as defined by the AHCI 1.1 standard)
-  - interrupts: interrupt specifier (refer to the interrupt binding)
-  - clocks: list of phandle and clock specifier pairs (or only
-            phandles for clock providers with '0' defined for
-            #clock-cells); two clocks must be specified: the functional
-            clock and an external reference clock
-
-Example:
-
-	sata: sata@4a140000 {
-		compatible = "ti,dm816-ahci";
-		reg = <0x4a140000 0x10000>;
-		interrupts = <16>;
-		clocks = <&sysclk5_ck>, <&sata_refclk>;
-	};

Documentation/devicetree/bindings/ata/ti,dm816-ahci.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ata/ti,dm816-ahci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI DM816 AHCI SATA Controller
+
+maintainers:
+  - Bartosz Golaszewski <[e-mail]>
+
+allOf:
+  - $ref: ahci-common.yaml#
+
+properties:
+  compatible:
+    const: ti,dm816-ahci
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: functional clock
+      - description: external reference clock
+
+  ti,hwmods:
+    const: sata
+
+required:
+  - compatible
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    sata@4a140000 {
+        compatible = "ti,dm816-ahci";
+        reg = <0x4a140000 0x10000>;
+        interrupts = <16>;
+        clocks = <&sysclk5_ck>, <&sata_refclk>;
+    };