xref: /freebsd/sys/contrib/device-tree/Bindings/reserved-memory/qcom,rmtfs-mem.yaml (revision 84943d6f38e936ac3b7a3947ca26eeb27a39f938)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/reserved-memory/qcom,rmtfs-mem.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Qualcomm Remote File System Memory

description: |
  This binding describes the Qualcomm remote filesystem memory, which serves the
  purpose of describing the shared memory region used for remote processors to
  access block device data using the Remote Filesystem protocol.

maintainers:
  - Bjorn Andersson <bjorn.andersson@linaro.org>

allOf:
  - $ref: reserved-memory.yaml

properties:
  compatible:
    const: qcom,rmtfs-mem

  qcom,client-id:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: >
      identifier of the client to use this region for buffers

  qcom,use-guard-pages:
    type: boolean
    description: >
      Indicates that the firmware, or hardware, does not gracefully handle
      memory protection of this region when placed adjacent to other protected
      memory regions, and that padding around the used portion of the memory
      region is necessary.

      When this is set, the first and last page should be left unused, and the
      effective size of the region will thereby shrink with two pages.

  qcom,vmid:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    description: >
      Array of vmids of the remote processors, to set up memory protection
    minItems: 1
    maxItems: 2

required:
  - qcom,client-id

unevaluatedProperties: false

examples:
  - |
    reserved-memory {
        #address-cells = <1>;
        #size-cells = <1>;
        ranges;

        rmtfs@86700000 {
            compatible = "qcom,rmtfs-mem";
            reg = <0x86700000 0xe0000>;
            no-map;

            qcom,client-id = <1>;
        };
    };