dt-bindings: watchdog: Add bindings for Intel Keem Bay SoC

Add Device Tree binding document for Watchdog IP in the Intel Keem Bay SoC.
Acked-by: Mark Gross <mgross@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/8c4dad4fb8ba644607aa9379d5ec70d8707d7e75.1608141131.git.vijayakannan.ayyathurai@intel.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/intel,keembay-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/intel,keembay-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intel Keem Bay SoC non-secure Watchdog Timer
+
+maintainers:
+  - Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
+
+properties:
+  compatible:
+    enum:
+      - intel,keembay-wdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: interrupt specifier for threshold interrupt line
+      - description: interrupt specifier for timeout interrupt line
+
+  interrupt-names:
+    items:
+      - const: threshold
+      - const: timeout
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #define KEEM_BAY_A53_TIM
+
+    watchdog: watchdog@2033009c {
+        compatible = "intel,keembay-wdt";
+        reg = <0x2033009c 0x10>;
+        interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "threshold", "timeout";
+        clocks = <&scmi_clk KEEM_BAY_A53_TIM>;
+    };
+
+...