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With Linux running in Trustzone non-secure world, OP-TEE OS runs in secure world, linux could use secure services provided by OP-TEE. With TEE/OP-TEE options selected, use the bindings in Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt to let the driver probe work. On i.MX6/7, now the bootflow is U-Boot->OP-TEE->Linux, OP-TEE will automatically create that node. Signed-off-by: Peng Fan --- V1: Tested on i.MX7D-SDB with/without OP-TEE OS. OP-TEE needs https://github.com/OP-TEE/optee_os/pull/2052 arch/arm/configs/imx_v6_v7_defconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig index 29cd1ac48987..72c4231d1b62 100644 --- a/arch/arm/configs/imx_v6_v7_defconfig +++ b/arch/arm/configs/imx_v6_v7_defconfig @@ -368,6 +368,8 @@ CONFIG_PWM=y CONFIG_PWM_FSL_FTM=y CONFIG_PWM_IMX=y CONFIG_NVMEM_IMX_OCOTP=y +CONFIG_TEE=y +CONFIG_OPTEE=y CONFIG_MUX_MMIO=y CONFIG_EXT2_FS=y CONFIG_EXT2_FS_XATTR=y