[PATCH 6/9] dt-bindings: arm: nvidia: Document the Tegra264 CCPLEX cluster

[Sumit Gupta <sumitg@nvidia.com>]

Add a compatible string for the CCPLEX cluster on Tegra264.

On Tegra264, two CPU clusters share one clock. Add the generic
"#performance-domain-cells" provider property so a CPU node can name
its domain with "performance-domains = <&ccplex N>", where N is the
index of the domain that clocks the CPU. The consumer side is already
described in bindings/arm/cpus.yaml.

The property is required on Tegra264, where a domain spans two clusters.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
 .../tegra/nvidia,tegra-ccplex-cluster.yaml    | 27 ++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra-ccplex-cluster.yaml b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra-ccplex-cluster.yaml
index fe9c8791f227..2bdb512fb677 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra-ccplex-cluster.yaml
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra-ccplex-cluster.yaml
@@ -25,6 +25,7 @@ properties:
       - nvidia,tegra186-ccplex-cluster
       - nvidia,tegra234-ccplex-cluster
       - nvidia,tegra238-ccplex-cluster
+      - nvidia,tegra264-ccplex-cluster
 
   reg:
     maxItems: 1
@@ -35,13 +36,29 @@ properties:
       Specifies the BPMP node that needs to be queried to get
       operating point data for all CPUs.
 
-additionalProperties: false
+  '#performance-domain-cells':
+    const: 1
+    description:
+      The cell is the index of the performance domain that clocks a CPU.
+      When present, every CPU names its domain with "performance-domains".
 
 required:
   - compatible
   - reg
   - nvidia,bpmp
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nvidia,tegra264-ccplex-cluster
+    then:
+      required:
+        - '#performance-domain-cells'
+
+additionalProperties: false
+
 examples:
   - |
     ccplex@e000000 {
@@ -49,3 +66,11 @@ examples:
       reg = <0x0e000000 0x5ffff>;
       nvidia,bpmp = <&bpmp>;
     };
+
+  - |
+    ccplex@30000000 {
+      compatible = "nvidia,tegra264-ccplex-cluster";
+      reg = <0x30000000 0xcf0000>;
+      #performance-domain-cells = <1>;
+      nvidia,bpmp = <&bpmp>;
+    };
-- 
2.34.1