Add new compatible string and clock definitions for the Ethernet MAC
IP found in MT8189 SoC.

Regarding the required clocks, the MT8189 datasheets list in the
paragraph related to this IP clocks the mac main and ptp reference
clocks as the ones to turn on.

No specific peripheral clock for Ethernet MAC is described in the SoC
clock list.  But at the same time, the Ethernet MAC block diagram,
present in the datasheets, shows this IP is interconnected to the rest
of SoC with AXI and APB interfaces (and in MT8188 datasheet too).
There is no APB related clock, that is specific to the IP in MT8189,
contrary to MT8188 or MT8195 that have one. But since it is on an APB
bus (likely shared between multiple IPs), then there is a bus clock for
peripheral access. Describing the IP having it makes sense, same thing
for AXI too, so the clock lists for this compatible are reflecting
that.

Also, don't allow mediatek,rmii-clk-from-mac property for MT8189
compatible.

Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
---
 .../devicetree/bindings/net/mediatek-dwmac.yaml    | 42 +++++++++++++++++++---
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/mediatek-dwmac.yaml b/Documentation/devicetree/bindings/net/mediatek-dwmac.yaml
index 956240616638..0fc2eed06646 100644
--- a/Documentation/devicetree/bindings/net/mediatek-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/mediatek-dwmac.yaml
@@ -20,13 +20,11 @@ select:
         enum:
           - mediatek,mt2712-gmac
           - mediatek,mt8188-gmac
+          - mediatek,mt8189-gmac
           - mediatek,mt8195-gmac
   required:
     - compatible
 
-allOf:
-  - $ref: snps,dwmac.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -36,6 +34,7 @@ properties:
           - const: snps,dwmac-4.20a
       - items:
           - enum:
+              - mediatek,mt8189-gmac
               - mediatek,mt8195-gmac
           - const: snps,dwmac-5.10a
       - items:
@@ -45,7 +44,7 @@ properties:
           - const: snps,dwmac-5.10a
 
   clocks:
-    minItems: 5
+    minItems: 4
     items:
       - description: AXI clock
       - description: APB clock
@@ -55,7 +54,7 @@ properties:
       - description: MAC clock gate
 
   clock-names:
-    minItems: 5
+    minItems: 4
     items:
       - const: axi
       - const: apb
@@ -153,6 +152,39 @@ required:
   - phy-mode
   - mediatek,pericfg
 
+allOf:
+  - $ref: snps,dwmac.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt2712-gmac
+              - mediatek,mt8188-gmac
+              - mediatek,mt8195-gmac
+    then:
+      properties:
+        clocks:
+          minItems: 5
+
+        clock-names:
+          minItems: 5
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt8189-gmac
+    then:
+      properties:
+        clocks:
+          maxItems: 4
+        clock-names:
+          maxItems: 4
+
+        mediatek,rmii-clk-from-mac: false
+
 unevaluatedProperties: false
 
 examples:

-- 
2.56.0