[PATCH v4] dt-bindings: drm/bridge: Update reg-name and reg

[Harikrishna Shenoy <h-shenoy@ti.com>]

Move register name constraints and reg description lists to appropriate
compatibility sections to ensure correct register names are used with each
compatible value. The j721e-integ registers are specific to TI SoCs and not
required for other compatibles.

Add DSC register descriptions to align bindings with hardware capabilities.
Structure the reg and reg-names constraints as lists according to
compatibles using oneOf schema construct.

Fixes: 7169d082e7e6 ("dt-bindings: drm/bridge: MHDP8546 bridge binding changes for HDCP")
Signed-off-by: Harikrishna Shenoy <h-shenoy@ti.com>
---

Links to some discussions pointing to need for a fixes patch: 
https://lore.kernel.org/all/20250903220312.GA2903503-robh@kernel.org/
https://lore.kernel.org/all/d2367789-6b54-4fc2-bb7c-609c0fe084d3@ti.com/

Link to v3:
<https://lore.kernel.org/all/20251121123437.860390-1-h-shenoy@ti.com/>

Changelog v3 --> v4:
- Update top level constraints and commit message.
- Update logs with processed schema- https://gist.github.com/h-shenoy/a422f7278859cd95447e674963caabd9

Link to v2:
<https://lore.kernel.org/all/20251119122447.514729-1-h-shenoy@ti.com/>

Changelog v2 --> v3:
-Add the reg description list and reg-name list in top level constraints
using oneOf for either of compatible.
Logs after testing some cases: https://gist.github.com/h-shenoy/a422f7278859cd95447e674963caabd9

Link to v1:
<https://lore.kernel.org/all/20251107131535.1841393-1-h-shenoy@ti.com/>

Changelog v1 --> v2:
-Update the reg description list for each compatible and add register space
for dsc to make the bindings reflect what hardware supports although 
the driver doesn't support dsc yet.

Note: j721e-integ are not optional registers for ti-compatible.

 .../display/bridge/cdns,mhdp8546.yaml         | 85 ++++++++++++++-----
 1 file changed, 66 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
index c2b369456e4e2..4cec0f4c22a2b 100644
--- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
@@ -17,23 +17,45 @@ properties:
       - ti,j721e-mhdp8546
 
   reg:
-    minItems: 1
-    items:
-      - description:
-          Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
-          The AUX and PMA registers are not part of this range, they are instead
-          included in the associated PHY.
-      - description:
-          Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
-      - description:
-          Register block of mhdptx sapb registers.
+    oneOf:
+      - items:
+          - description:
+              Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
+              The AUX and PMA registers are not part of this range, they are instead
+              included in the associated PHY.
+          - description:
+              Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
+          - description:
+              Register block of mhdptx sapb registers.
+          - description:
+              Register block for mhdptx DSC encoder registers.
+        minItems: 2
+
+      - items:
+          - description:
+              Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
+              The AUX and PMA registers are not part of this range, they are instead
+              included in the associated PHY.
+          - description:
+              Register block of mhdptx sapb registers.
+          - description:
+              Register block for mhdptx DSC encoder registers.
+        minItems: 1
 
   reg-names:
-    minItems: 1
-    items:
-      - const: mhdptx
-      - const: j721e-intg
-      - const: mhdptx-sapb
+    oneOf:
+      - items:
+          - const: mhdptx
+          - const: j721e-intg
+          - const: mhdptx-sapb
+          - const: dsc
+        minItems: 2
+
+      - items:
+          - const: mhdptx
+          - const: mhdptx-sapb
+          - const: dsc
+        minItems: 1
 
   clocks:
     maxItems: 1
@@ -100,18 +122,43 @@ allOf:
       properties:
         reg:
           minItems: 2
-          maxItems: 3
+          items:
+            - description:
+                Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
+                The AUX and PMA registers are not part of this range, they are instead
+                included in the associated PHY.
+            - description:
+                Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
+            - description:
+                Register block of mhdptx sapb registers.
+            - description:
+                Register block for mhdptx DSC encoder registers.
         reg-names:
           minItems: 2
-          maxItems: 3
+          items:
+            - const: mhdptx
+            - const: j721e-intg
+            - const: mhdptx-sapb
+            - const: dsc
     else:
       properties:
         reg:
           minItems: 1
-          maxItems: 2
+          items:
+            - description:
+                Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
+                The AUX and PMA registers are not part of this range, they are instead
+                included in the associated PHY.
+            - description:
+                Register block of mhdptx sapb registers.
+            - description:
+                Register block for mhdptx DSC encoder registers.
         reg-names:
           minItems: 1
-          maxItems: 2
+          items:
+            - const: mhdptx
+            - const: mhdptx-sapb
+            - const: dsc
 
 required:
   - compatible
-- 
2.34.1