baikal,bt1-apb.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 # Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
    3 %YAML 1.2
    4 ---
    5 $id: http://devicetree.org/schemas/bus/baikal,bt1-apb.yaml#
    6 $schema: http://devicetree.org/meta-schemas/core.yaml#
    7 
    8 title: Baikal-T1 APB-bus
    9 
   10 maintainers:
   11   - Serge Semin <fancer.lancer@gmail.com>
   12 
   13 description: |
   14   Baikal-T1 CPU or DMAC MMIO requests are handled by the AMBA 3 AXI Interconnect
   15   which routes them to the AXI-APB bridge. This interface is a single master
   16   multiple slaves bus in turn serializing IO accesses and routing them to the
   17   addressed APB slave devices. In case of any APB protocol collisions, slave
   18   device not responding on timeout an IRQ is raised with an erroneous address
   19   reported to the APB terminator (APB Errors Handler Block).
   20 
   21 allOf:
   22   - $ref: /schemas/simple-bus.yaml#
   23 
   24 properties:
   25   compatible:
   26     contains:
   27       const: baikal,bt1-apb
   28 
   29   reg:
   30     items:
   31       - description: APB EHB MMIO registers
   32       - description: APB MMIO region with no any device mapped
   33 
   34   reg-names:
   35     items:
   36       - const: ehb
   37       - const: nodev
   38 
   39   interrupts:
   40     maxItems: 1
   41 
   42   clocks:
   43     items:
   44       - description: APB reference clock
   45 
   46   clock-names:
   47     items:
   48       - const: pclk
   49 
   50   resets:
   51     items:
   52       - description: APB domain reset line
   53 
   54   reset-names:
   55     items:
   56       - const: prst
   57 
   58 unevaluatedProperties: false
   59 
   60 required:
   61   - compatible
   62   - reg
   63   - reg-names
   64   - interrupts
   65   - clocks
   66   - clock-names
   67 
   68 examples:
   69   - |
   70     #include <dt-bindings/interrupt-controller/mips-gic.h>
   71 
   72     bus@1f059000 {
   73       compatible = "baikal,bt1-apb", "simple-bus";
   74       reg = <0x1f059000 0x1000>,
   75             <0x1d000000 0x2040000>;
   76       reg-names = "ehb", "nodev";
   77       #address-cells = <1>;
   78       #size-cells = <1>;
   79 
   80       ranges;
   81 
   82       interrupts = <GIC_SHARED 16 IRQ_TYPE_LEVEL_HIGH>;
   83 
   84       clocks = <&ccu_sys 1>;
   85       clock-names = "pclk";
   86 
   87       resets = <&ccu_sys 1>;
   88       reset-names = "prst";
   89     };
   90 ...

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sys/contrib/device-tree/Bindings/bus/baikal,bt1-apb.yaml