dt-bindings: power: reset: restart-handler: add common schema

Add common schema for restart and shutdown handlers, so they all use
same meaning of "priority" field.  The Linux drivers already have this
property and some systems want to customize it per-board in DTS.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/reset/gpio-restart.yaml

@@ -25,6 +25,9 @@ description: >
   inactive-delay, the GPIO is driven active again.  After a delay specified by wait-delay, the
   restart handler completes allowing other restart handlers to be attempted.
 
+allOf:
+  - $ref: restart-handler.yaml#
+
 properties:
   compatible:
     const: gpio-restart
@@ -41,16 +44,6 @@ properties:
       in its inactive state.
 
   priority:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description: |
-      A priority ranging from 0 to 255 (default 129) according to the following guidelines:
-
-        0:   Restart handler of last resort, with limited restart capabilities.
-        128: Default restart handler; use if no other restart handler is expected to be available,
-             and/or if restart functionality is sufficient to restart the entire system.
-        255: Highest priority restart handler, will preempt all other restart handlers.
-    minimum: 0
-    maximum: 255
     default: 129
 
   active-delay:

Documentation/devicetree/bindings/power/reset/restart-handler.yaml

@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/reset/restart-handler.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Restart and shutdown handler generic binding
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+description:
+  Restart and shutdown handler device is responsible for powering off the
+  system, e.g. my cutting off the power.  System might have several restart
+  handlers, which usually are tried from most precise to last resort.
+
+properties:
+  priority:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      A priority ranging from 0 to 255 according to the following guidelines::
+        0::   Restart handler of last resort, with limited restart capabilities.
+        128:: Typical, default restart handler; use if no other restart handler
+              is expected to be available, and/or if restart functionality is
+              sufficient to restart the entire system.
+        255:: Highest priority restart handler, will preempt all other restart handlers.
+    minimum: 0
+    maximum: 255
+
+additionalProperties: true