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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
%YAML 1.2
---
$id: http://devicetree.org/schemas/cache/baikal,bt1-l2-ctl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Baikal-T1 L2-cache Control Block
maintainers:
- Serge Semin <fancer.lancer@gmail.com>
description: |
By means of the System Controller Baikal-T1 SoC exposes a few settings to
tune the MIPS P5600 CM2 L2 cache performance up. In particular it's possible
to change the Tag, Data and Way-select RAM access latencies. Baikal-T1
L2-cache controller block is responsible for the tuning. Its DT node is
supposed to be a child of the system controller.
properties:
compatible:
const: baikal,bt1-l2-ctl
reg:
maxItems: 1
baikal,l2-ws-latency:
$ref: /schemas/types.yaml#/definitions/uint32
description: Cycles of latency for Way-select RAM accesses
default: 0
minimum: 0
maximum: 3
baikal,l2-tag-latency:
$ref: /schemas/types.yaml#/definitions/uint32
description: Cycles of latency for Tag RAM accesses
default: 0
minimum: 0
maximum: 3
baikal,l2-data-latency:
$ref: /schemas/types.yaml#/definitions/uint32
description: Cycles of latency for Data RAM accesses
default: 1
minimum: 0
maximum: 3
additionalProperties: false
required:
- compatible
examples:
- |
l2@1f04d028 {
compatible = "baikal,bt1-l2-ctl";
reg = <0x1f04d028 0x004>;
baikal,l2-ws-latency = <1>;
baikal,l2-tag-latency = <1>;
baikal,l2-data-latency = <2>;
};
...
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