[PATCH v2 1/2] dt-bindings: watchdog: realtek,otto-wdt: Add fallback compatible

[Sander Vanheule]

As all known hardware instantiations of this watchdog behave the same, a
fallback compatible can be added.

To remain compatible with existing single-compatible bindings, the
current compatibles are duplicated. New compatibles should only be added
to the list with fallback.

Signed-off-by: Sander Vanheule <sander@xxxxxxxxxxxxx>
---
Changes since v1:
- Fix indendations
- Add deprecated property to old compatible
- Use two-part compatible in example
---
 .../bindings/watchdog/realtek,otto-wdt.yaml   | 22 ++++++++++++++-----
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/realtek,otto-wdt.yaml b/Documentation/devicetree/bindings/watchdog/realtek,otto-wdt.yaml
index 1f5390a67cdb..e470e0fcbb2a 100644
--- a/Documentation/devicetree/bindings/watchdog/realtek,otto-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/realtek,otto-wdt.yaml
@@ -25,11 +25,21 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - realtek,rtl8380-wdt
-      - realtek,rtl8390-wdt
-      - realtek,rtl9300-wdt
-      - realtek,rtl9310-wdt
+    oneOf:
+      - items:
+          - enum:
+              - realtek,rtl8380-wdt
+              - realtek,rtl8390-wdt
+              - realtek,rtl9300-wdt
+              - realtek,rtl9310-wdt
+          - const: realtek,otto-wdt
+      # Legacy without fallback, do not extend
+      - deprecated: true
+        enum:
+          - realtek,rtl8380-wdt
+          - realtek,rtl8390-wdt
+          - realtek,rtl9300-wdt
+          - realtek,rtl9310-wdt
 
   reg:
     maxItems: 1
@@ -74,7 +84,7 @@ unevaluatedProperties: false
 examples:
   - |
     watchdog: watchdog@3150 {
-        compatible = "realtek,rtl8380-wdt";
+        compatible = "realtek,rtl8380-wdt", "realtek,otto-wdt";
         reg = <0x3150 0xc>;
 
         realtek,reset-mode = "soc";
-- 
2.54.0