FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/arm/tegra/nvidia,tegra234-cbb.yaml

     # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
     %YAML 1.2
     ---
     $id: "http://devicetree.org/schemas/arm/tegra/nvidia,tegra234-cbb.yaml#"
     $schema: "http://devicetree.org/meta-schemas/core.yaml#"
     
     title: NVIDIA Tegra CBB 2.0 bindings
     
     maintainers:
      - Sumit Gupta <sumitg@nvidia.com>
    
    description: |+
      The Control Backbone (CBB) is comprised of the physical path from an
      initiator to a target's register configuration space. CBB 2.0 consists
      of multiple sub-blocks connected to each other to create a topology.
      The Tegra234 SoC has different fabrics based on CBB 2.0 architecture
      which include cluster fabrics BPMP, AON, PSC, SCE, RCE, DCE, FSI and
      "CBB central fabric".
    
      In CBB 2.0, each initiator which can issue transactions connects to a
      Root Master Node (MN) before it connects to any other element of the
      fabric. Each Root MN contains a Error Monitor (EM) which detects and
      logs error. Interrupts from various EM blocks are collated by Error
      Notifier (EN) which is per fabric and presents a single interrupt from
      fabric to the SoC interrupt controller.
    
      The driver handles errors from CBB due to illegal register accesses
      and prints debug information about failed transaction on receiving
      the interrupt from EN. Debug information includes Error Code, Error
      Description, MasterID, Fabric, SlaveID, Address, Cache, Protection,
      Security Group etc on receiving error notification.
    
      If the Error Response Disable (ERD) is set/enabled for an initiator,
      then SError or Data abort exception error response is masked and an
      interrupt is used for reporting errors due to illegal accesses from
      that initiator. The value returned on read failures is '0xFFFFFFFF'
      for compatibility with PCIE.
    
    properties:
      $nodename:
        pattern: "^[a-z]+-fabric@[0-9a-f]+$"
    
      compatible:
        enum:
          - nvidia,tegra234-aon-fabric
          - nvidia,tegra234-bpmp-fabric
          - nvidia,tegra234-cbb-fabric
          - nvidia,tegra234-dce-fabric
          - nvidia,tegra234-rce-fabric
          - nvidia,tegra234-sce-fabric
    
      reg:
        maxItems: 1
    
      interrupts:
        items:
          - description: secure interrupt from error notifier
    
    additionalProperties: false
    
    required:
      - compatible
      - reg
      - interrupts
    
    examples:
      - |
        #include <dt-bindings/interrupt-controller/arm-gic.h>
    
        cbb-fabric@1300000 {
          compatible = "nvidia,tegra234-cbb-fabric";
          reg = <0x13a00000 0x400000>;
          interrupts = <GIC_SPI 231 IRQ_TYPE_LEVEL_HIGH>;
        };

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