# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/arm/firmware/linaro,optee-tz.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: OP-TEE Device Tree Bindings

maintainers:
  - Jens Wiklander <jens.wiklander@linaro.org>

description: |
  OP-TEE is a piece of software using hardware features to provide a Trusted
  Execution Environment. The security can be provided with ARM TrustZone, but
  also by virtualization or a separate chip.

  We're using "linaro" as the first part of the compatible property for
  the reference implementation maintained by Linaro.

properties:
  $nodename:
    const: optee

  compatible:
    const: linaro,optee-tz

  method:
    enum: [smc, hvc]
    description: |
      The method of calling the OP-TEE Trusted OS depending on smc or hvc
      instruction usage.
      SMC #0, register assignments
      or
      HVC #0, register assignments
      register assignments are specified in drivers/tee/optee/optee_smc.h

required:
  - compatible
  - method

additionalProperties: false

examples:
  - |
    firmware  {
        optee  {
            compatible = "linaro,optee-tz";
            method = "smc";
        };
    };

  - |
    firmware  {
        optee  {
            compatible = "linaro,optee-tz";
            method = "hvc";
        };
    };