[PATCH v4] dt-bindings: display: mediatek: split: add subschema property constraints

[Moudy Ho]

The display node in mt8195.dtsi was triggering a CHECK_DTBS error due
to an excessively long 'clocks' property:
  display at 14f06000: clocks: [[31, 14], [31, 43], [31, 44]] is too long

To resolve this issue, the constraints for 'clocks' and
other properties within the subschema will be reinforced.

Fixes: 739058a9c5c3 ("dt-bindings: display: mediatek: split: add compatible for MT8195")
Signed-off-by: Macpaul Lin <macpaul.lin at mediatek.com>
Signed-off-by: Moudy Ho <moudy.ho at mediatek.com>

--
This is based on [v2] dt-bindings: display: mediatek: split: add clocks count constraint for MT8195

Changes since v3:
  - Correct the compatible name for the mt8173 split in the subschema.

Changes since v2:
  - Revise the commit message.
  - Enhance the descriptions of 'clocks'.
  - Strengthen the conditions within the subschema.

Changes since v1:
  - Adding functional descriptions and quantity restrictions.
---
 .../display/mediatek/mediatek,split.yaml      | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
index e4affc854f3d..87f8477a7be8 100644
--- a/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
+++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,split.yaml
@@ -57,6 +57,9 @@ properties:
   clocks:
     items:
       - description: SPLIT Clock
+      - description: Used for interfacing with the HDMI RX signal source.
+      - description: Paired with receiving HDMI RX metadata.
+    minItems: 1
 
 required:
   - compatible
@@ -72,9 +75,30 @@ allOf:
             const: mediatek,mt8195-mdp3-split
 
     then:
+      properties:
+        clocks:
+          maxItems: 3
+
+        power-domains:
+          maxItems: 1
+
       required:
         - mediatek,gce-client-reg
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8173-disp-split
+
+    then:
+      properties:
+        clocks:
+          maxItems: 1
+
+        power-domains:
+          maxItems: 1
+
 additionalProperties: false
 
 examples:
-- 
2.34.1