dt-bindings: rtc: rtc-sh: convert bindings to json-schema

Convert Real Time Clock for Renesas SH and ARM SoCs bindings documentation
to json-schema.  Also name bindings documentation file according to the
compat string being documented.

Also correct syntax error in interrupts field in example.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/rtc/renesas,sh-rtc.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/renesas,sh-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Real Time Clock for Renesas SH and ARM SoCs
+
+maintainers:
+  - Chris Brandt <chris.brandt@renesas.com>
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+properties:
+  compatible:
+    items:
+      - const: renesas,r7s72100-rtc  # RZ/A1H
+      - const: renesas,sh-rtc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 3
+
+  interrupt-names:
+    items:
+      - const: alarm
+      - const: period
+      - const: carry
+
+  clocks:
+    # The functional clock source for the RTC controller must be listed
+    # first (if it exists). Additionally, potential clock counting sources
+    # are to be listed.
+    minItems: 1
+    maxItems: 4
+
+  clock-names:
+    # The functional clock must be labeled as "fck". Other clocks
+    # may be named in accordance to the SoC hardware manuals.
+    minItems: 1
+    maxItems: 4
+    items:
+      enum: [ fck, rtc_x1, rtc_x3, extal ]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    #include <dt-bindings/clock/r7s72100-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    rtc: rtc@fcff1000 {
+        compatible = "renesas,r7s72100-rtc", "renesas,sh-rtc";
+        reg = <0xfcff1000 0x2e>;
+        interrupts = <GIC_SPI 276 IRQ_TYPE_EDGE_RISING>,
+                     <GIC_SPI 277 IRQ_TYPE_EDGE_RISING>,
+                     <GIC_SPI 278 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "alarm", "period", "carry";
+        clocks = <&mstp6_clks R7S72100_CLK_RTC>, <&rtc_x1_clk>,
+                 <&rtc_x3_clk>, <&extal_clk>;
+        clock-names = "fck", "rtc_x1", "rtc_x3", "extal";
+    };

Documentation/devicetree/bindings/rtc/rtc-sh.txt

-* Real Time Clock for Renesas SH and ARM SoCs
-
-Required properties:
-- compatible: Should be "renesas,r7s72100-rtc" and "renesas,sh-rtc" as a
-  fallback.
-- reg: physical base address and length of memory mapped region.
-- interrupts: 3 interrupts for alarm, period, and carry.
-- interrupt-names: The interrupts should be labeled as "alarm", "period", and
-  "carry".
-- clocks: The functional clock source for the RTC controller must be listed
-  first (if exists). Additionally, potential clock counting sources are to be
-  listed.
-- clock-names: The functional clock must be labeled as "fck". Other clocks
-  may be named in accordance to the SoC hardware manuals.
-
-
-Example:
-rtc: rtc@fcff1000 {
-	compatible = "renesas,r7s72100-rtc", "renesas,sh-rtc";
-	reg = <0xfcff1000 0x2e>;
-	interrupts = <GIC_SPI 276 IRQ_TYPE_EDGE_RISING
-		      GIC_SPI 277 IRQ_TYPE_EDGE_RISING
-		      GIC_SPI 278 IRQ_TYPE_EDGE_RISING>;
-	interrupt-names = "alarm", "period", "carry";
-	clocks = <&mstp6_clks R7S72100_CLK_RTC>, <&rtc_x1_clk>,
-		 <&rtc_x3_clk>, <&extal_clk>;
-	clock-names = "fck", "rtc_x1", "rtc_x3", "extal";
-};