[PATCH 4/4] dt-bindings: cache: Add docs for StarFive StarLink-500 cache controller

[Joshua Yeong <joshua.yeong@starfivetech.com>]

Add DT binding documentation used by StarFive's
Starlink-500 cache controller.

Signed-off-by: Joshua Yeong <joshua.yeong@starfivetech.com>
---
 .../cache/starfive,starlink-500-cache.yaml    | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cache/starfive,starlink-500-cache.yaml

diff --git a/Documentation/devicetree/bindings/cache/starfive,starlink-500-cache.yaml b/Documentation/devicetree/bindings/cache/starfive,starlink-500-cache.yaml
new file mode 100644
index 000000000000..97ddf7db39e9
--- /dev/null
+++ b/Documentation/devicetree/bindings/cache/starfive,starlink-500-cache.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cache/starfive,starlink-500-cache.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive StarLink-500 Cache Controller
+
+maintainers:
+  - Joshua Yeong <joshua.yeong@starfivetech.com>
+
+description:
+  StarFive's StarLink-500 controller manages cache shared between clusters of
+  CPU cores. The cache driver provides mechanism to perform invalidate and write
+  back functionality to the shared memory.
+
+allOf:
+  - $ref: /schemas/cache-controller.yaml#
+
+# We need a select here so we don't match all nodes with 'cache'
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - starfive,starlink-500-cache
+
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: starfive,starlink-500-cache
+      - const: cache
+
+  reg:
+    maxItems: 1
+
+  cache-size: true
+  cache-sets: true
+  cache-block-size: true
+  cache-level: true
+  cache-unified: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+      cache-controller@15000000 {
+        compatible = "starfive,starlink-500-cache", "cache";
+        reg = <0x15000000 0x278>;
+        cache-block-size = <64>;
+        cache-level = <3>;
+        cache-sets = <8192>;
+        cache-size = <0x400000>;
+        cache-unified;
+      };
-- 
2.25.1


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