1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/arm/firmware/linaro,optee-tz.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: OP-TEE Device Tree Bindings 8 9maintainers: 10 - Jens Wiklander <jens.wiklander@linaro.org> 11 12description: | 13 OP-TEE is a piece of software using hardware features to provide a Trusted 14 Execution Environment. The security can be provided with ARM TrustZone, but 15 also by virtualization or a separate chip. 16 17 We're using "linaro" as the first part of the compatible property for 18 the reference implementation maintained by Linaro. 19 20properties: 21 $nodename: 22 const: optee 23 24 compatible: 25 const: linaro,optee-tz 26 27 method: 28 enum: [smc, hvc] 29 description: | 30 The method of calling the OP-TEE Trusted OS depending on smc or hvc 31 instruction usage. 32 SMC #0, register assignments 33 or 34 HVC #0, register assignments 35 register assignments are specified in drivers/tee/optee/optee_smc.h 36 37required: 38 - compatible 39 - method 40 41additionalProperties: false 42 43examples: 44 - | 45 firmware { 46 optee { 47 compatible = "linaro,optee-tz"; 48 method = "smc"; 49 }; 50 }; 51 52 - | 53 firmware { 54 optee { 55 compatible = "linaro,optee-tz"; 56 method = "hvc"; 57 }; 58 }; 59