[PATCH v1 3/6] dt-bindings: cache: Add SiFive Extensible Cache controller

[Samuel Holland]

From: Eric Lin <eric.lin at sifive.com>

Add YAML DT binding documentation for the SiFive Extensible Cache
controller. The Extensible Cache controller interleaves cache blocks
across a number of heterogeneous independently-programmed slices. Each
slice contains an MMIO interface for configuration, cache maintenance,
error reporting, and performance monitoring.

Signed-off-by: Eric Lin <eric.lin at sifive.com>
Co-developed-by: Samuel Holland <samuel.holland at sifive.com>
Signed-off-by: Samuel Holland <samuel.holland at sifive.com>
---

 .../cache/sifive,extensiblecache0.yaml        | 136 ++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cache/sifive,extensiblecache0.yaml

diff --git a/Documentation/devicetree/bindings/cache/sifive,extensiblecache0.yaml b/Documentation/devicetree/bindings/cache/sifive,extensiblecache0.yaml
new file mode 100644
index 000000000000..d027114dbdba
--- /dev/null
+++ b/Documentation/devicetree/bindings/cache/sifive,extensiblecache0.yaml
@@ -0,0 +1,136 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (C) 2023-2024 SiFive, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cache/sifive,extensiblecache0.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SiFive Extensible Cache Controller
+
+maintainers:
+  - Eric Lin <eric.lin at sifive.com>
+
+description:
+  The SiFive Extensible Cache Controller provides a high-performance extensible
+  system (L2 or L3) cache. It is divided into several independent heterogeneous
+  slices, enabling a flexible topology and physical design.
+
+allOf:
+  - $ref: /schemas/cache-controller.yaml#
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - sifive,extensiblecache0
+
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: sifive,extensiblecache0
+      - const: cache
+
+  "#address-cells": true
+  "#size-cells": true
+  ranges: true
+
+  interrupts:
+    maxItems: 1
+
+  cache-block-size:
+    const: 64
+
+  cache-level: true
+  cache-sets: true
+  cache-size: true
+  cache-unified: true
+
+patternProperties:
+  "^cache-controller@[0-9a-f]+$":
+    type: object
+    additionalProperties: false
+    properties:
+      reg:
+        maxItems: 1
+
+      cache-block-size:
+        const: 64
+
+      cache-sets: true
+      cache-size: true
+      cache-unified: true
+
+      sifive,bm-event-counters:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        default: 0
+        description: Number of bucket monitor registers in this slice
+
+      sifive,cache-ways:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Number of ways in this slice (independent of cache size)
+
+      sifive,perfmon-counters:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        default: 0
+        description: Number of PMU counter registers in this slice
+
+    required:
+      - reg
+      - cache-block-size
+      - cache-sets
+      - cache-size
+      - cache-unified
+      - sifive,cache-ways
+
+required:
+  - compatible
+  - ranges
+  - interrupts
+  - cache-block-size
+  - cache-level
+  - cache-sets
+  - cache-size
+  - cache-unified
+
+additionalProperties: false
+
+examples:
+  - |
+    cache-controller at 30040000 {
+        compatible = "sifive,extensiblecache0", "cache";
+        ranges = <0x30040000 0x30040000 0x10000>;
+        interrupts = <0x4>;
+        cache-block-size = <0x40>;
+        cache-level = <3>;
+        cache-sets = <0x800>;
+        cache-size = <0x100000>;
+        cache-unified;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        cache-controller at 30040000 {
+            reg = <0x30040000 0x4000>;
+            cache-block-size = <0x40>;
+            cache-sets = <0x400>;
+            cache-size = <0x80000>;
+            cache-unified;
+            sifive,bm-event-counters = <8>;
+            sifive,cache-ways = <9>;
+            sifive,perfmon-counters = <8>;
+        };
+
+        cache-controller at 30044000 {
+            reg = <0x30044000 0x4000>;
+            cache-block-size = <0x40>;
+            cache-sets = <0x400>;
+            cache-size = <0x80000>;
+            cache-unified;
+            sifive,bm-event-counters = <8>;
+            sifive,cache-ways = <9>;
+            sifive,perfmon-counters = <8>;
+        };
+    };
-- 
2.43.0