dt-bindings: clock: Convert axis,artpec6-clkctrl to DT schema

Convert the Axis ARTPEC-6 clock controller to DT schema format. It's a
straight forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/artpec6.txt

···
-* Clock bindings for Axis ARTPEC-6 chip
-
-The bindings are based on the clock provider binding in
-Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-External clocks:
-----------------
-
-There are two external inputs to the main clock controller which should be
-provided using the common clock bindings.
-- "sys_refclk": External 50 Mhz oscillator (required)
-- "i2s_refclk": Alternate audio reference clock (optional).
-
-Main clock controller
----------------------
-
-Required properties:
-- #clock-cells: Should be <1>
-  See dt-bindings/clock/axis,artpec6-clkctrl.h for the list of valid identifiers.
-- compatible: Should be "axis,artpec6-clkctrl"
-- reg: Must contain the base address and length of the system controller
-- clocks:  Must contain a phandle entry for each clock in clock-names
-- clock-names: Must include the external oscillator ("sys_refclk"). Optional
-  ones are the audio reference clock ("i2s_refclk") and the audio fractional
-  dividers ("frac_clk0" and "frac_clk1").
-
-Examples:
-
-ext_clk: ext_clk {
-	#clock-cells = <0>;
-	compatible = "fixed-clock";
-	clock-frequency = <50000000>;
-};
-
-clkctrl: clkctrl@f8000000 {
-	#clock-cells = <1>;
-	compatible = "axis,artpec6-clkctrl";
-	reg = <0xf8000000 0x48>;
-	clocks = <&ext_clk>;
-	clock-names = "sys_refclk";
-};

Documentation/devicetree/bindings/clock/axis,artpec6-clkctrl.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/axis,artpec6-clkctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Axis ARTPEC-6 clock controller
+
+maintainers:
+  - Lars Persson <[e-mail]>
+
+properties:
+  compatible:
+    const: axis,artpec6-clkctrl
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: external 50 MHz oscillator.
+      - description: optional audio reference clock.
+      - description: fractional audio clock divider 0.
+      - description: fractional audio clock divider 1.
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: sys_refclk
+      - const: i2s_refclk
+      - const: frac_clk0
+      - const: frac_clk1
+
+required:
+  - compatible
+  - reg
+  - "#clock-cells"
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@f8000000 {
+        compatible = "axis,artpec6-clkctrl";
+        reg = <0xf8000000 0x48>;
+        #clock-cells = <1>;
+        clocks = <&ext_clk>;
+        clock-names = "sys_refclk";
+    };