xref: /openbmc/linux/Documentation/devicetree/bindings/arm/arm,coresight-cpu-debug.yaml (revision 66d05204)

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/arm/arm,coresight-cpu-debug.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: CoreSight CPU Debug Component

maintainers:
  - Mathieu Poirier <mathieu.poirier@linaro.org>
  - Mike Leach <mike.leach@linaro.org>
  - Leo Yan <leo.yan@linaro.org>
  - Suzuki K Poulose <suzuki.poulose@arm.com>

description: |
  CoreSight CPU debug component are compliant with the ARMv8 architecture
  reference manual (ARM DDI 0487A.k) Chapter 'Part H: External debug'. The
  external debug module is mainly used for two modes: self-hosted debug and
  external debug, and it can be accessed from mmio region from Coresight and
  eventually the debug module connects with CPU for debugging. And the debug
  module provides sample-based profiling extension, which can be used to sample
  CPU program counter, secure state and exception level, etc; usually every CPU
  has one dedicated debug module to be connected.

select:
  properties:
    compatible:
      contains:
        const: arm,coresight-cpu-debug
  required:
    - compatible

allOf:
  - $ref: /schemas/arm/primecell.yaml#

properties:
  compatible:
    items:
      - const: arm,coresight-cpu-debug
      - const: arm,primecell

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  clock-names:
    maxItems: 1

  cpu:
    description:
      A phandle to the cpu this debug component is bound to.
    $ref: /schemas/types.yaml#/definitions/phandle

  power-domains:
    maxItems: 1
    description:
      A phandle to the debug power domain if the debug logic has its own
      dedicated power domain. CPU idle states may also need to be separately
      constrained to keep CPU cores powered.

required:
  - compatible
  - reg
  - clocks
  - clock-names
  - cpu

unevaluatedProperties: false

examples:
  - |
    debug@f6590000 {
        compatible = "arm,coresight-cpu-debug", "arm,primecell";
        reg = <0xf6590000 0x1000>;
        clocks = <&sys_ctrl 1>;
        clock-names = "apb_pclk";
        cpu = <&cpu0>;
    };
...