dt-bindings: watchdog: mediatek: Convert mtk-wdt to json-schema

Convert the MediaTek watchdog bindings to schema.

The original binding only had 4 without a fallback but there is a reset
controller on the "mediatek,mt7986-wdt", "mediatek,mt8186-wdt",
"mediatek,mt8188-wdt" and "mediatek,mt8195-wdt" Since there is no reset
controller for the mt6589, we remove "mediatek,mt6589-wdt" as a
fallback.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Co-developed-by: Allen-KH Cheng <[email protected]>
Signed-off-by: Allen-KH Cheng <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Reviewed-by: Nícolas F. R. A. Prado <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: AngeloGioacchino Del Regno

Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/mediatek,mtk-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek SoCs Watchdog timer
+
+maintainers:
+  - Matthias Brugger <[email protected]>
+
+description:
+  The watchdog supports a pre-timeout interrupt that fires
+  timeout-sec/2 before the expiry.
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - mediatek,mt2712-wdt
+          - mediatek,mt6589-wdt
+          - mediatek,mt7986-wdt
+          - mediatek,mt8183-wdt
+          - mediatek,mt8186-wdt
+          - mediatek,mt8188-wdt
+          - mediatek,mt8192-wdt
+          - mediatek,mt8195-wdt
+      - items:
+          - enum:
+              - mediatek,mt2701-wdt
+              - mediatek,mt6582-wdt
+              - mediatek,mt6797-wdt
+              - mediatek,mt7622-wdt
+              - mediatek,mt7623-wdt
+              - mediatek,mt7629-wdt
+              - mediatek,mt8516-wdt
+          - const: mediatek,mt6589-wdt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: Watchdog pre-timeout (bark) interrupt
+
+  mediatek,disable-extrst:
+    description: Disable sending output reset signal
+    type: boolean
+
+  '#reset-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        watchdog: watchdog@10007000 {
+            compatible = "mediatek,mt8183-wdt";
+            reg = <0 0x10007000 0 0x100>;
+            interrupts = <GIC_SPI 139 IRQ_TYPE_LEVEL_LOW>;
+            mediatek,disable-extrst;
+            timeout-sec = <10>;
+            #reset-cells = <1>;
+        };
+    };