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/cache/baikal,bt1-l2-ctl.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: Baikal-T1 L2-cache Control Block
9
10 maintainers:
11 - Serge Semin <fancer.lancer@gmail.com>
12
13 description: |
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
20 properties:
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
48 additionalProperties: false
49
50 required:
51 - compatible
52
53 examples:
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 ...
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.