[RFC PATCH 1/9] dt-bindings: clock: renesas,cpg-mssr: Support RZ/T2H system controllers

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>

The RZ/T2H SoC features system controller blocks for low-power management
and access control that reside within the CPG/MSSR address space. To
properly represent these hardware modules, allow them to be defined as
child nodes of the CPG/MSSR controller.

Update the CPG/MSSR binding to support child nodes by adding
system-controller child nodes using a patternProperty, requiring a reg
property and a renesas,sys-block property to identify the controller
instance.

Restrict these new properties to the RZ/T2H SoC to ensure existing
bindings for other Renesas SoCs remain unaffected.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
 .../bindings/clock/renesas,cpg-mssr.yaml      | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/renesas,cpg-mssr.yaml b/Documentation/devicetree/bindings/clock/renesas,cpg-mssr.yaml
index 655154534c0f..ec13fcaf763e 100644
--- a/Documentation/devicetree/bindings/clock/renesas,cpg-mssr.yaml
+++ b/Documentation/devicetree/bindings/clock/renesas,cpg-mssr.yaml
@@ -99,6 +99,41 @@ properties:
       the datasheet.
     const: 1
 
+  '#address-cells':
+    description:
+      Required for the RZ/T2H SoC to define the address space for child
+      system-controller nodes.
+    const: 2
+
+  '#size-cells':
+    description:
+      Required for the RZ/T2H SoC to define the size of the register
+      blocks for child system-controller nodes.
+    const: 2
+
+  ranges:
+    description:
+      Required for the RZ/T2H SoC to provide 1:1 address translation
+      from the child system-controller nodes to the CPU address space.
+
+patternProperties:
+  "^system-controller@[0-9a-f]+$":
+    type: object
+    description:
+      System controller child nodes representing sub-blocks for
+      Low Power Management (LPM) and Access Control.
+    properties:
+      reg:
+        maxItems: 1
+      renesas,sys-block:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Index of the system controller instance.
+        enum: [0, 1]
+    required:
+      - reg
+      - renesas,sys-block
+    additionalProperties: false
+
 required:
   - compatible
   - reg
@@ -126,6 +161,10 @@ allOf:
       properties:
         reg:
           maxItems: 1
+        '#address-cells': false
+        '#size-cells': false
+      patternProperties:
+        "^system-controller@[0-9a-f]+$": false
   - if:
       not:
         properties:
-- 
2.54.0