[PATCH v2 1/4] dt-bindings: PCI: renesas,r9a08g045-pcie: Add RZ/V2H(P) support

[Prabhakar]

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

Add support for the PCIe controller found on the Renesas RZ/V2H(P) SoC.

The RZ/V2H(P) controller is similar to the RZ/G3E variant but includes
additional registers and configuration bits for PCIe lane control. It
supports multilink operation configured as either a single x4 link
or two independent x2 link controllers.

Unlike earlier SoCs supported by this driver which only feature a single
PCIe controller, the RZ/V2H(P) SoC implements two controllers. Both
controllers rely on the system controller (`sysc`) for configuration,
but the required registers reside at different offsets for each instance.
To correctly identify the controller instance and map the corresponding
system controller registers, make the "linux,pci-domain" and "num-lanes"
properties mandatory for this SoC and restrict their values according to
the hardware capabilities.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
v1->v2:
- Updated commit message.
- Dropped un-necessary new line in schema.
---
 .../bindings/pci/renesas,r9a08g045-pcie.yaml  | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
index 90086909e921..149a2973b16e 100644
--- a/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/renesas,r9a08g045-pcie.yaml
@@ -14,7 +14,7 @@ description: |
   with PCIe Base Specification 4.0 and supports different link speeds
   depending on the SoC variant:
     - Gen2 (5 GT/s): RZ/G3S
-    - Gen3 (8 GT/s): RZ/G3E, RZ/V2N
+    - Gen3 (8 GT/s): RZ/G3E, RZ/V2H(P), RZ/V2N
 
 properties:
   compatible:
@@ -22,6 +22,7 @@ properties:
       - enum:
           - renesas,r9a08g045-pcie # RZ/G3S
           - renesas,r9a09g047-pcie # RZ/G3E
+          - renesas,r9a09g057-pcie # RZ/V2H(P)
       - items:
           - const: renesas,r9a09g056-pcie # RZ/V2N
           - const: renesas,r9a09g047-pcie
@@ -220,7 +221,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: renesas,r9a09g047-pcie
+            enum:
+              - renesas,r9a09g047-pcie
+              - renesas,r9a09g057-pcie
     then:
       properties:
         interrupts:
@@ -235,6 +238,20 @@ allOf:
           maxItems: 1
         reset-names:
           maxItems: 1
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g057-pcie
+    then:
+      properties:
+        linux,pci-domain:
+          enum: [0, 1]
+        num-lanes:
+          enum: [2, 4]
+      required:
+        - linux,pci-domain
+        - num-lanes
 
 unevaluatedProperties: false
 
-- 
2.54.0