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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/bus/baikal,bt1-apb.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Baikal-T1 APB-bus
maintainers:
- Serge Semin <fancer.lancer@gmail.com>
description: |
Baikal-T1 CPU or DMAC MMIO requests are handled by the AMBA 3 AXI Interconnect
which routes them to the AXI-APB bridge. This interface is a single master
multiple slaves bus in turn serializing IO accesses and routing them to the
addressed APB slave devices. In case of any APB protocol collisions, slave
device not responding on timeout an IRQ is raised with an erroneous address
reported to the APB terminator (APB Errors Handler Block).
allOf:
- $ref: /schemas/simple-bus.yaml#
properties:
compatible:
contains:
const: baikal,bt1-apb
reg:
items:
- description: APB EHB MMIO registers
- description: APB MMIO region with no any device mapped
reg-names:
items:
- const: ehb
- const: nodev
interrupts:
maxItems: 1
clocks:
items:
- description: APB reference clock
clock-names:
items:
- const: pclk
resets:
items:
- description: APB domain reset line
reset-names:
items:
- const: prst
unevaluatedProperties: false
required:
- compatible
- reg
- reg-names
- interrupts
- clocks
- clock-names
examples:
- |
#include <dt-bindings/interrupt-controller/mips-gic.h>
bus@1f059000 {
compatible = "baikal,bt1-apb", "simple-bus";
reg = <0x1f059000 0x1000>,
<0x1d000000 0x2040000>;
reg-names = "ehb", "nodev";
#address-cells = <1>;
#size-cells = <1>;
ranges;
interrupts = <GIC_SHARED 16 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ccu_sys 1>;
clock-names = "pclk";
resets = <&ccu_sys 1>;
reset-names = "prst";
};
...
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