watchdog: dt-bindings: atmel,at91sam9-wdt: convert to json-schema

Convert at91sam9 WDT binding for Atmel/Microchip SoCs to json-schema
format.
Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220714125122.144377-1-sergiu.moga@microchip.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/atmel,at91sam9-wdt.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/atmel,at91sam9-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel Watchdog Timers
+
+maintainers:
+  - Eugen Hristev <eugen.hristev@microchip.com>
+
+properties:
+  compatible:
+    const: atmel,at91sam9260-wdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  atmel,max-heartbeat-sec:
+    description:
+      Should contain the maximum heartbeat value in seconds. This value
+      should be less or equal to 16. It is used to compute the WDV field.
+    maximum: 16
+
+  atmel,min-heartbeat-sec:
+    description:
+      Should contain the minimum heartbeat value in seconds. This value
+      must be smaller than the max-heartbeat-sec value. It is used to
+      compute the WDD field.
+    maximum: 16
+
+  atmel,watchdog-type:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: |
+      Should be hardware or software.
+    oneOf:
+      - description:
+          Hardware watchdog uses the at91 watchdog reset.
+        const: hardware
+      - description: |
+          Software watchdog uses the watchdog interrupt
+          to trigger a software reset.
+        const: software
+    default: hardware
+
+  atmel,reset-type:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: |
+      Should be proc or all. This is valid only when using hardware watchdog.
+    oneOf:
+      - description:
+          Assert peripherals and processor reset signals.
+        const: all
+      - description:
+          Assert the processor reset signal.
+        const: proc
+    default: all
+
+  atmel,disable:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Should be present if you want to stop the watchdog.
+
+  atmel,idle-halt:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Should be present if you want to stop the watchdog when
+      entering idle state.
+      CAUTION: This property should be used with care, it actually makes the
+      watchdog not counting when the CPU is in idle state, therefore the
+      watchdog reset time depends on mean CPU usage and will not reset at all
+      if the CPU stops working while it is in idle state, which is probably
+      not what you want.
+
+  atmel,dbg-halt:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Should be present if you want to stop the watchdog when
+      entering debug state.
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+allOf:
+  - $ref: watchdog.yaml#
+  - if:
+      properties:
+        atmel,reset-type:
+          enum:
+            - all
+            - proc
+    then:
+      properties:
+        atmel,watchdog-type:
+          const: hardware
+
+dependencies:
+  atmel,reset-type: ['atmel,watchdog-type']
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    watchdog@fffffd40 {
+        compatible = "atmel,at91sam9260-wdt";
+        reg = <0xfffffd40 0x10>;
+        interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
+        clocks = <&clk32k>;
+        timeout-sec = <15>;
+        atmel,watchdog-type = "hardware";
+        atmel,reset-type = "all";
+        atmel,dbg-halt;
+        atmel,idle-halt;
+        atmel,max-heartbeat-sec = <16>;
+        atmel,min-heartbeat-sec = <0>;
+    };

Documentation/devicetree/bindings/watchdog/atmel-wdt.txt

-* Atmel Watchdog Timers
-
-** at91sam9-wdt
-
-Required properties:
-- compatible: must be "atmel,at91sam9260-wdt".
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- clocks: phandle to input clock.
-
-Optional properties:
-- timeout-sec: contains the watchdog timeout in seconds.
-- interrupts : Should contain WDT interrupt.
-- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
-	seconds. This value should be less or equal to 16. It is used to
-	compute the WDV field.
-- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
-	seconds. This value must be smaller than the max-heartbeat-sec value.
-	It is used to compute the WDD field.
-- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
-	use the at91 watchdog reset. Software watchdog use the watchdog
-	interrupt to trigger a software reset.
-- atmel,reset-type : Should be "proc" or "all".
-	"all" : assert peripherals and processor reset signals
-	"proc" : assert the processor reset signal
-	This is valid only when using "hardware" watchdog.
-- atmel,disable : Should be present if you want to disable the watchdog.
-- atmel,idle-halt : Should be present if you want to stop the watchdog when
-	entering idle state.
-	CAUTION: This property should be used with care, it actually makes the
-	watchdog not counting when the CPU is in idle state, therefore the
-	watchdog reset time depends on mean CPU usage and will not reset at all
-	if the CPU stop working while it is in idle state, which is probably
-	not what you want.
-- atmel,dbg-halt : Should be present if you want to stop the watchdog when
-	entering debug state.
-
-Example:
-	watchdog@fffffd40 {
-		compatible = "atmel,at91sam9260-wdt";
-		reg = <0xfffffd40 0x10>;
-		interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
-		clocks = <&clk32k>;
-		timeout-sec = <15>;
-		atmel,watchdog-type = "hardware";
-		atmel,reset-type = "all";
-		atmel,dbg-halt;
-		atmel,idle-halt;
-		atmel,max-heartbeat-sec = <16>;
-		atmel,min-heartbeat-sec = <0>;
-	};