dt-bindings: power: reset: atmel,sama5d2-shdwc: convert to yaml

Convert Microchip AT91 SAMA5D2 shutdown controller to YAML. SAMA7G5 SHDWC
DT node (available in arch/arm/boot/dts/sama7g5.dtsi) has syscon along with
its compatible. There is no usage of this syscon in the current code but it
may be necessary in future as some registers of SHDWC are accessed in
different drivers (at91-sama5d2_shdwc.c and arch/arm/mach-at91/pm.c).
Thus update the YAML with it to make DT checkers happy.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: claudiubeznea

Documentation/devicetree/bindings/arm/atmel-sysregs.txt

@@ -52,69 +52,6 @@ Example:
 		reg = <0xe3804000 0x1000>;
 };
 
-SHDWC SAMA5D2-Compatible Shutdown Controller
-
-1) shdwc node
-
-required properties:
-- compatible: should be "atmel,sama5d2-shdwc", "microchip,sam9x60-shdwc" or
-  "microchip,sama7g5-shdwc"
-- reg: should contain registers location and length
-- clocks: phandle to input clock.
-- #address-cells: should be one. The cell is the wake-up input index.
-- #size-cells: should be zero.
-
-optional properties:
-
-- debounce-delay-us: minimum wake-up inputs debouncer period in
-  microseconds. It's usually a board-related property.
-- atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
-
-optional microchip,sam9x60-shdwc or microchip,sama7g5-shdwc properties:
-- atmel,wakeup-rtt-timer: boolean to enable Real-time Timer Wake-up.
-
-The node contains child nodes for each wake-up input that the platform uses.
-
-2) input nodes
-
-Wake-up input nodes are usually described in the "board" part of the Device
-Tree. Note also that input 0 is linked to the wake-up pin and is frequently
-used.
-
-Required properties:
-- reg: should contain the wake-up input index [0 - 15].
-
-Optional properties:
-- atmel,wakeup-active-high: boolean, the corresponding wake-up input described
-  by the child, forces the wake-up of the core power supply on a high level.
-  The default is to be active low.
-
-Example:
-
-On the SoC side:
-	shdwc@f8048010 {
-		compatible = "atmel,sama5d2-shdwc";
-		reg = <0xf8048010 0x10>;
-		clocks = <&clk32k>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		atmel,wakeup-rtc-timer;
-	};
-
-On the board side:
-	shdwc@f8048010 {
-		debounce-delay-us = <976>;
-
-		input@0 {
-			reg = <0>;
-		};
-
-		input@1 {
-			reg = <1>;
-			atmel,wakeup-active-high;
-		};
-	};
-
 Special Function Registers (SFR)
 
 Special Function Registers (SFR) manage specific aspects of the integrated

Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml

@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/reset/atmel,sama5d2-shdwc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip AT91 SAMA5D2 SHDWC Shutdown Controller
+
+maintainers:
+  - Claudiu Beznea <claudiu.beznea@microchip.com>
+
+description: |
+  Microchip AT91 SHDWC shutdown controller controls the power supplies VDDIO
+  and VDDCORE and the wake-up detection on debounced input lines.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: microchip,sama7g5-shdwc
+          - const: syscon
+      - enum:
+          - atmel,sama5d2-shdwc
+          - microchip,sam9x60-shdwc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  debounce-delay-us:
+    description:
+      Minimum wake-up inputs debouncer period in microseconds. It is usually a
+      board-related property.
+
+  atmel,wakeup-rtc-timer:
+    description: enable real-time clock wake-up
+    type: boolean
+
+  atmel,wakeup-rtt-timer:
+    description: enable real-time timer wake-up
+    type: boolean
+
+patternProperties:
+  "^input@[0-15]$":
+    description:
+      Wake-up input nodes. These are usually described in the "board" part of
+      the Device Tree. Note also that input 0 is linked to the wake-up pin and
+      is frequently used.
+    type: object
+    properties:
+      reg:
+        description: contains the wake-up input index
+        minimum: 0
+        maximum: 15
+
+      atmel,wakeup-active-high:
+        description:
+          The corresponding wake-up input described by the child forces the
+          wake-up of the core power supply on a high level. The default is to
+          be active low.
+        type: boolean
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: atmel,sama5d2-shdwc
+    then:
+      properties:
+        atmel,wakeup-rtt-timer: false
+
+additionalProperties: false
+
+examples:
+  - |
+    shdwc: poweroff@f8048010 {
+        compatible = "atmel,sama5d2-shdwc";
+        reg = <0xf8048010 0x10>;
+        clocks = <&clk32k>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        atmel,wakeup-rtc-timer;
+        debounce-delay-us = <976>;
+
+        input@0 {
+            reg = <0>;
+        };
+
+        input@1 {
+            reg = <1>;
+            atmel,wakeup-active-high;
+        };
+    };
+
+...