1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2# Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
3%YAML 1.2
4---
5$id: http://devicetree.org/schemas/memory-controllers/baikal,bt1-l2-ctl.yaml#
6$schema: http://devicetree.org/meta-schemas/core.yaml#
7
8title: Baikal-T1 L2-cache Control Block
9
10maintainers:
11  - Serge Semin <fancer.lancer@gmail.com>
12
13description: |
14  By means of the System Controller Baikal-T1 SoC exposes a few settings to
15  tune the MIPS P5600 CM2 L2 cache performance up. In particular it's possible
16  to change the Tag, Data and Way-select RAM access latencies. Baikal-T1
17  L2-cache controller block is responsible for the tuning. Its DT node is
18  supposed to be a child of the system controller.
19
20properties:
21  compatible:
22    const: baikal,bt1-l2-ctl
23
24  reg:
25    maxItems: 1
26
27  baikal,l2-ws-latency:
28    $ref: /schemas/types.yaml#/definitions/uint32
29    description: Cycles of latency for Way-select RAM accesses
30    default: 0
31    minimum: 0
32    maximum: 3
33
34  baikal,l2-tag-latency:
35    $ref: /schemas/types.yaml#/definitions/uint32
36    description: Cycles of latency for Tag RAM accesses
37    default: 0
38    minimum: 0
39    maximum: 3
40
41  baikal,l2-data-latency:
42    $ref: /schemas/types.yaml#/definitions/uint32
43    description: Cycles of latency for Data RAM accesses
44    default: 1
45    minimum: 0
46    maximum: 3
47
48additionalProperties: false
49
50required:
51  - compatible
52
53examples:
54  - |
55    l2@1f04d028 {
56      compatible = "baikal,bt1-l2-ctl";
57      reg = <0x1f04d028 0x004>;
58
59      baikal,l2-ws-latency = <1>;
60      baikal,l2-tag-latency = <1>;
61      baikal,l2-data-latency = <2>;
62    };
63...
64