dt-bindings: watchdog: renesas-wdt: Convert to json-schema

Convert the Renesas Watchdog Timer (WDT) Controller Device Tree binding
documentation to json-schema.

Add missing "renesas,r8a77980-wdt" compatible value.
Document missing properties.
Update the example to match reality.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
new file mode 100644
index 000000000000..27e8c4accd67
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/renesas,wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Watchdog Timer (WDT) Controller
+
+maintainers:
+  - Wolfram Sang <wsa+renesas@sang-engineering.com>
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+
+allOf:
+  - $ref: "watchdog.yaml#"
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - renesas,r7s72100-wdt     # RZ/A1
+              - renesas,r7s9210-wdt      # RZ/A2
+          - const: renesas,rza-wdt       # RZ/A
+
+      - items:
+          - enum:
+              - renesas,r8a7743-wdt      # RZ/G1M
+              - renesas,r8a7744-wdt      # RZ/G1N
+              - renesas,r8a7745-wdt      # RZ/G1E
+              - renesas,r8a77470-wdt     # RZ/G1C
+              - renesas,r8a7790-wdt      # R-Car H2
+              - renesas,r8a7791-wdt      # R-Car M2-W
+              - renesas,r8a7792-wdt      # R-Car V2H
+              - renesas,r8a7793-wdt      # R-Car M2-N
+              - renesas,r8a7794-wdt      # R-Car E2
+          - const: renesas,rcar-gen2-wdt # R-Car Gen2 and RZ/G1
+
+      - items:
+          - enum:
+              - renesas,r8a774a1-wdt     # RZ/G2M
+              - renesas,r8a774b1-wdt     # RZ/G2N
+              - renesas,r8a774c0-wdt     # RZ/G2E
+              - renesas,r8a7795-wdt      # R-Car H3
+              - renesas,r8a7796-wdt      # R-Car M3-W
+              - renesas,r8a77961-wdt     # R-Car M3-W+
+              - renesas,r8a77965-wdt     # R-Car M3-N
+              - renesas,r8a77970-wdt     # R-Car V3M
+              - renesas,r8a77980-wdt     # R-Car V3H
+              - renesas,r8a77990-wdt     # R-Car E3
+              - renesas,r8a77995-wdt     # R-Car D3
+          - const: renesas,rcar-gen3-wdt # R-Car Gen3 and RZ/G2
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  timeout-sec: true
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+if:
+  not:
+    properties:
+      compatible:
+        contains:
+          enum:
+            - renesas,rza-wdt
+then:
+  required:
+    - power-domains
+    - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
+    #include <dt-bindings/power/r8a7795-sysc.h>
+    wdt0: watchdog@e6020000 {
+            compatible = "renesas,r8a7795-wdt", "renesas,rcar-gen3-wdt";
+            reg = <0xe6020000 0x0c>;
+            clocks = <&cpg CPG_MOD 402>;
+            power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
+            resets = <&cpg 402>;
+            timeout-sec = <60>;
+    };