D1 keeps the same register layout and clock sources as the R329, but it
adds a key field which must be set to update the watchdog's "CFG" and
"MODE" registers. Therefore it is not backward-compatible.

Similarly to the R329, the D1 has three watchdog instances, and only one
of them has the "soft reset" registers. So that instance needs an extra
compatible string.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
Changes v2 to v3:
 - Add additional allwinner,sun20i-d1-wdt-reset compatible
Changes v1 to v2:
 - None

 .../bindings/watchdog/allwinner,sun4i-a10-wdt.yaml          | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml b/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml
index 877f47759814..44cad9427ae6 100644
--- a/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/allwinner,sun4i-a10-wdt.yaml

@@ -30,6 +30,10 @@ properties:
       - items:
           - const: allwinner,suniv-f1c100s-wdt
           - const: allwinner,sun4i-a10-wdt
+      - const: allwinner,sun20i-d1-wdt
+      - items:
+          - const: allwinner,sun20i-d1-wdt-reset
+          - const: allwinner,sun20i-d1-wdt
 
   reg:
     maxItems: 1

@@ -62,6 +66,8 @@ if:
     compatible:
       contains:
         enum:
+          - allwinner,sun20i-d1-wdt
+          - allwinner,sun20i-d1-wdt-reset
           - allwinner,sun50i-r329-wdt
           - allwinner,sun50i-r329-wdt-reset
 

-- 
2.31.1


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