xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/reserved-memory/nvidia,tegra264-bpmp-shmem.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Tegra CPU-NS - BPMP IPC reserved memory

maintainers:
  - Peter De Schrijver <pdeschrijver@nvidia.com>

description: |
  Define a memory region used for communication between CPU-NS and BPMP.
  Typically this node is created by the bootloader as the physical address
  has to be known to both CPU-NS and BPMP for correct IPC operation.
  The memory region is defined using a child node under /reserved-memory.
  The sub-node is named shmem@<address>.

allOf:
  - $ref: reserved-memory.yaml

properties:
  compatible:
    const: nvidia,tegra264-bpmp-shmem

  reg:
    description: The physical address and size of the shared SDRAM region

unevaluatedProperties: false

required:
  - compatible
  - reg
  - no-map

examples:
  - |
    reserved-memory {
       #address-cells = <2>;
       #size-cells = <2>;
       dram_cpu_bpmp_mail: shmem@f1be0000 {
           compatible = "nvidia,tegra264-bpmp-shmem";
           reg = <0x0 0xf1be0000 0x0 0x2000>;
           no-map;
       };
    };
...