[PATCH v2 2/3] dt-bindings: i2c: mt7621: add Airoha AN7589

[John Crispin <john@phrozen.org>]

The Airoha AN7589 carries the MT7621 I2C controller with a second
control register holding a wider clock divider. Out of reset the
controller uses the MT7621 divider, so the MT7621 programming works
and mediatek,mt7621-i2c serves as the fallback. Give the AN7589 a
compatible of its own so the driver can use the wider divider.

Signed-off-by: John Crispin <john@phrozen.org>
---
Changes in v2:
- Add mediatek,mt7621-i2c as the fallback compatible (Conor).

 .../devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml b/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml
index 118ec00fc190..ec42e72e267f 100644
--- a/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/mediatek,mt7621-i2c.yaml
@@ -9,12 +9,20 @@ maintainers:
 
 title: Mediatek MT7621/MT7628 I2C master controller
 
+description:
+  The same controller is used on Airoha SoCs. The AN7589 variant adds a
+  second control register with a wider clock divider.
+
 allOf:
   - $ref: /schemas/i2c/i2c-controller.yaml#
 
 properties:
   compatible:
-    const: mediatek,mt7621-i2c
+    oneOf:
+      - const: mediatek,mt7621-i2c
+      - items:
+          - const: airoha,an7589-i2c
+          - const: mediatek,mt7621-i2c
 
   reg:
     maxItems: 1
-- 
2.34.1