dt-bindings: riscv: sifive-l2-cache: convert bindings to json-schema

Convert the device tree bindings for the SiFive's FU540-C000 SoC's L2 Cache
controller to YAML format.
Signed-off-by: Sagar Kadam <sagar.kadam@sifive.com>
Link: https://lore.kernel.org/r/1601381896-29716-2-git-send-email-sagar.kadam@sifive.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/riscv/sifive-l2-cache.txt

-SiFive L2 Cache Controller
---------------------------
-The SiFive Level 2 Cache Controller is used to provide access to fast copies
-of memory for masters in a Core Complex. The Level 2 Cache Controller also
-acts as directory-based coherency manager.
-All the properties in ePAPR/DeviceTree specification applies for this platform
-
-Required Properties:
---------------------
-- compatible: Should be "sifive,fu540-c000-ccache" and "cache"
-
-- cache-block-size: Specifies the block size in bytes of the cache.
-  Should be 64
-
-- cache-level: Should be set to 2 for a level 2 cache
-
-- cache-sets: Specifies the number of associativity sets of the cache.
-  Should be 1024
-
-- cache-size: Specifies the size in bytes of the cache. Should be 2097152
-
-- cache-unified: Specifies the cache is a unified cache
-
-- interrupts: Must contain 3 entries (DirError, DataError and DataFail signals)
-
-- reg: Physical base address and size of L2 cache controller registers map
-
-Optional Properties:
---------------------
-- next-level-cache: phandle to the next level cache if present.
-
-- memory-region: reference to the reserved-memory for the L2 Loosely Integrated
-  Memory region. The reserved memory node should be defined as per the bindings
-  in reserved-memory.txt
-
-
-Example:
-
-	cache-controller@2010000 {
-		compatible = "sifive,fu540-c000-ccache", "cache";
-		cache-block-size = <64>;
-		cache-level = <2>;
-		cache-sets = <1024>;
-		cache-size = <2097152>;
-		cache-unified;
-		interrupt-parent = <&plic0>;
-		interrupts = <1 2 3>;
-		reg = <0x0 0x2010000 0x0 0x1000>;
-		next-level-cache = <&L25 &L40 &L36>;
-		memory-region = <&l2_lim>;
-	};

Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright (C) 2020 SiFive, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/sifive-l2-cache.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SiFive L2 Cache Controller
+
+maintainers:
+  - Sagar Kadam <sagar.kadam@sifive.com>
+  - Yash Shah <yash.shah@sifive.com>
+  - Paul Walmsley  <paul.walmsley@sifive.com>
+
+description:
+  The SiFive Level 2 Cache Controller is used to provide access to fast copies
+  of memory for masters in a Core Complex. The Level 2 Cache Controller also
+  acts as directory-based coherency manager.
+  All the properties in ePAPR/DeviceTree specification applies for this platform.
+
+allOf:
+  - $ref: /schemas/cache-controller.yaml#
+
+select:
+  properties:
+    compatible:
+      items:
+       - enum:
+          - sifive,fu540-c000-ccache
+
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: sifive,fu540-c000-ccache
+      - const: cache
+
+  cache-block-size:
+    const: 64
+
+  cache-level:
+    const: 2
+
+  cache-sets:
+    const: 1024
+
+  cache-size:
+    const: 2097152
+
+  cache-unified: true
+
+  interrupts:
+    description: |
+      Must contain entries for DirError, DataError and DataFail signals.
+    minItems: 3
+    maxItems: 3
+
+  reg:
+    maxItems: 1
+
+  next-level-cache: true
+
+  memory-region:
+    description: |
+      The reference to the reserved-memory for the L2 Loosely Integrated Memory region.
+      The reserved memory node should be defined as per the bindings in reserved-memory.txt.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - cache-block-size
+  - cache-level
+  - cache-sets
+  - cache-size
+  - cache-unified
+  - interrupts
+  - reg
+
+examples:
+  - |
+    cache-controller@2010000 {
+        compatible = "sifive,fu540-c000-ccache", "cache";
+        cache-block-size = <64>;
+        cache-level = <2>;
+        cache-sets = <1024>;
+        cache-size = <2097152>;
+        cache-unified;
+        reg = <0x2010000 0x1000>;
+        interrupt-parent = <&plic0>;
+        interrupts = <1>,
+                     <2>,
+                     <3>;
+        next-level-cache = <&L25>;
+        memory-region = <&l2_lim>;
+    };