[PATCH v3] dt-bindings: drm/bridge: Update reg-name and reg description list for cdns,mhdp8546 compatible

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

Remove j721e-intg register name from reg-name list for cdns,mhdp8546
compatible. The j721e-integ registers are specific to TI SoCs, so they
are not required for compatibles other than ti,j721e-mhdp8546.

Update reg and reg-names top level constraints with lists according
to compatibles.

Move the register name constraints and reg description list to the
appropriate compatibility sections to ensure the correct register
names are used with each compatible value also adding the DSC register
to make bindings align with what the hardware supports.

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 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..632595ef32f63 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:
+      - 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 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: 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 of mhdptx sapb registers.
+          - description:
+              Register block for mhdptx DSC encoder registers.
 
   reg-names:
-    minItems: 1
-    items:
-      - const: mhdptx
-      - const: j721e-intg
-      - const: mhdptx-sapb
+    oneOf:
+      - minItems: 2
+      - items:
+          - const: mhdptx
+          - const: j721e-intg
+          - const: mhdptx-sapb
+          - const: dsc
+
+      - minItems: 1
+      - items:
+          - const: mhdptx
+          - const: mhdptx-sapb
+          - const: dsc
 
   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