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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-axi.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Baikal-T1 AXI-bus
maintainers:
- Serge Semin <fancer.lancer@gmail.com>
description: |
AXI3-bus is the main communication bus of Baikal-T1 SoC connecting all
high-speed peripheral IP-cores with RAM controller and with MIPS P5600
cores. Traffic arbitration is done by means of DW AXI Interconnect (so
called AXI Main Interconnect) routing IO requests from one block to
another: from CPU to SoC peripherals and between some SoC peripherals
(mostly between peripheral devices and RAM, but also between DMA and
some peripherals). In case of any protocol error, device not responding
an IRQ is raised and a faulty situation is reported to the AXI EHB
(Errors Handler Block) embedded on top of the DW AXI Interconnect and
accessible by means of the Baikal-T1 System Controller.
allOf:
- $ref: /schemas/simple-bus.yaml#
properties:
compatible:
contains:
const: baikal,bt1-axi
reg:
minItems: 1
items:
- description: Synopsys DesignWare AXI Interconnect QoS registers
- description: AXI EHB MMIO system controller registers
reg-names:
minItems: 1
items:
- const: qos
- const: ehb
'#interconnect-cells':
const: 1
syscon:
$ref: /schemas/types.yaml#definitions/phandle
description: Phandle to the Baikal-T1 System Controller DT node
interrupts:
maxItems: 1
clocks:
items:
- description: Main Interconnect uplink reference clock
clock-names:
items:
- const: aclk
resets:
items:
- description: Main Interconnect reset line
reset-names:
items:
- const: arst
unevaluatedProperties: false
required:
- compatible
- reg
- reg-names
- syscon
- interrupts
- clocks
- clock-names
examples:
- |
#include <dt-bindings/interrupt-controller/mips-gic.h>
bus@1f05a000 {
compatible = "baikal,bt1-axi", "simple-bus";
reg = <0x1f05a000 0x1000>,
<0x1f04d110 0x8>;
reg-names = "qos", "ehb";
#address-cells = <1>;
#size-cells = <1>;
#interconnect-cells = <1>;
syscon = <&syscon>;
ranges;
interrupts = <GIC_SHARED 127 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ccu_axi 0>;
clock-names = "aclk";
resets = <&ccu_axi 0>;
reset-names = "arst";
};
...
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