# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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# Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/bus/baikal,bt1-apb.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Baikal-T1 APB-bus
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maintainers:
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- Serge Semin <fancer.lancer@gmail.com>
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description: |
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Baikal-T1 CPU or DMAC MMIO requests are handled by the AMBA 3 AXI Interconnect
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which routes them to the AXI-APB bridge. This interface is a single master
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multiple slaves bus in turn serializing IO accesses and routing them to the
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addressed APB slave devices. In case of any APB protocol collisions, slave
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device not responding on timeout an IRQ is raised with an erroneous address
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reported to the APB terminator (APB Errors Handler Block).
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allOf:
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- $ref: /schemas/simple-bus.yaml#
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properties:
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compatible:
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contains:
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const: baikal,bt1-apb
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reg:
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items:
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- description: APB EHB MMIO registers
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- description: APB MMIO region with no any device mapped
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reg-names:
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items:
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- const: ehb
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- const: nodev
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interrupts:
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maxItems: 1
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clocks:
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items:
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- description: APB reference clock
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clock-names:
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items:
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- const: pclk
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resets:
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items:
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- description: APB domain reset line
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reset-names:
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items:
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- const: prst
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unevaluatedProperties: false
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required:
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- compatible
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- reg
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- reg-names
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- interrupts
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- clocks
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- clock-names
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examples:
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- |
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#include <dt-bindings/interrupt-controller/mips-gic.h>
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bus@1f059000 {
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compatible = "baikal,bt1-apb", "simple-bus";
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reg = <0x1f059000 0x1000>,
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<0x1d000000 0x2040000>;
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reg-names = "ehb", "nodev";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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interrupts = <GIC_SHARED 16 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&ccu_sys 1>;
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clock-names = "pclk";
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resets = <&ccu_sys 1>;
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reset-names = "prst";
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};
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...
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