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90 lines
1.9 KiB
90 lines
1.9 KiB
# 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 <[email protected]> |
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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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