dt-bindings: clock: renesas,r9a06g032-sysctrl: Convert to json-schema

Convert the Renesas RZ/N1D (R9A06G032) System Controller (SYSCTRL)
Device Tree binding documentation to json-schema.

Drop the consumer example, as it doesn't belong here.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/24d1bd7c4c46747f4e2828974c2e2e48e778bff8.1620119439.git.geert+renesas@glider.beSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.txt

-* Renesas R9A06G032 SYSCTRL
-
-Required Properties:
-
-  - compatible: Must be:
-    - "renesas,r9a06g032-sysctrl"
-  - reg: Base address and length of the SYSCTRL IO block.
-  - #clock-cells: Must be 1
-  - clocks: References to the parent clocks:
-	- external 40mhz crystal.
-	- external (optional) 32.768khz
-	- external (optional) jtag input
-	- external (optional) RGMII_REFCLK
-  - clock-names: Must be:
-        clock-names = "mclk", "rtc", "jtag", "rgmii_ref_ext";
-  - #power-domain-cells: Must be 0
-
-Examples
---------
-
-  - SYSCTRL node:
-
-	sysctrl: system-controller@4000c000 {
-		compatible = "renesas,r9a06g032-sysctrl";
-		reg = <0x4000c000 0x1000>;
-		#clock-cells = <1>;
-
-		clocks = <&ext_mclk>, <&ext_rtc_clk>,
-				<&ext_jtag_clk>, <&ext_rgmii_ref>;
-		clock-names = "mclk", "rtc", "jtag", "rgmii_ref_ext";
-		#power-domain-cells = <0>;
-	};
-
-  - Other nodes can use the clocks provided by SYSCTRL as in:
-
-	#include <dt-bindings/clock/r9a06g032-sysctrl.h>
-	uart0: serial@40060000 {
-		compatible = "snps,dw-apb-uart";
-		reg = <0x40060000 0x400>;
-		interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
-		reg-shift = <2>;
-		reg-io-width = <4>;
-		clocks = <&sysctrl R9A06G032_CLK_UART0>, <&sysctrl R9A06G032_HCLK_UART0>;
-		clock-names = "baudclk", "apb_pclk";
-		power-domains = <&sysctrl>;
-	};

Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/renesas,r9a06g032-sysctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas RZ/N1D (R9A06G032) System Controller
+
+maintainers:
+  - Gareth Williams <gareth.williams.jx@renesas.com>
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+properties:
+  compatible:
+    const: renesas,r9a06g032-sysctrl
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: External 40 MHz crystal
+      - description: Optional external 32.768 kHz crystal
+      - description: Optional external JTAG input
+      - description: Optional external RGMII_REFCLK
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: mclk
+      - const: rtc
+      - const: jtag
+      - const: rgmii_ref_ext
+
+  '#clock-cells':
+    const: 1
+
+  '#power-domain-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - '#clock-cells'
+  - '#power-domain-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    sysctrl: system-controller@4000c000 {
+            compatible = "renesas,r9a06g032-sysctrl";
+            reg = <0x4000c000 0x1000>;
+            clocks = <&ext_mclk>, <&ext_rtc_clk>, <&ext_jtag_clk>,
+                     <&ext_rgmii_ref>;
+            clock-names = "mclk", "rtc", "jtag", "rgmii_ref_ext";
+            #clock-cells = <1>;
+            #power-domain-cells = <0>;
+    };