[PATCH 1/2] dt-bindings: watchdog: Add Renesas WWDT

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

Describe the Window Watchdog Timer found on Renesas R-Car SoCs from late
Gen3 onwards.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

Passes the binding check here.

 .../bindings/watchdog/renesas,wwdt.yaml       | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/renesas,wwdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wwdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wwdt.yaml
new file mode 100644
index 000000000000..921713dd40fa
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/renesas,wwdt.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/renesas,wwdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Window Watchdog Timer (WWDT) Controller
+
+maintainers:
+  - Wolfram Sang <wsa+renesas@sang-engineering.com>
+
+properties:
+  compatible:
+    items:
+      - const: renesas,r8a779g0-wwdt  # V4H
+      - const: renesas,rcar-gen4-wwdt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Pretimeout, 75% of overflow reached
+      - description: Error occurred
+
+  interrupt-names:
+    items:
+      - const: pretimeout
+      - const: error
+
+  clocks:
+    items:
+      - description: Bus clock
+      - description: Counting clock
+
+  clock-names:
+    items:
+      - const: bus
+      - const: cnt
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - power-domains
+
+allOf:
+  - $ref: watchdog.yaml#
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a779g0-cpg-mssr.h>
+    #include <dt-bindings/power/r8a779g0-sysc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    wwdt0: watchdog@ffc90000 {
+            compatible = "renesas,r8a779g0-wwdt",
+                         "renesas,rcar-gen4-wwdt";
+            reg = <0xffc90000 0x10>;
+            interrupts = <GIC_SPI 310 IRQ_TYPE_LEVEL_HIGH>,
+                         <GIC_SPI 311 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "pretimeout", "error";
+            clocks = <&cpg CPG_CORE R8A779G0_CLK_SASYNCRT>,
+                     <&cpg CPG_CORE R8A779G0_CLK_R>;
+            clock-names = "bus", "cnt";
+            power-domains = <&sysc R8A779G0_PD_ALWAYS_ON>;
+            resets = <&cpg 1200>;
+    };
-- 
2.47.2