xen/arm: optee: document OPTEE option in tee/Kconfig

Add basic information about the OP-TEE mediator and note about
dependency on virtualization-aware OP-TEE.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Acked-by: Julien Grall <julien.grall@arm.com>

diff --git a/xen/arch/arm/tee/Kconfig b/xen/arch/arm/tee/Kconfig
index 5b829db2e9fc533769c22bea38e1d7836b10effe..b4b6aa26106e110611ad507f63f7a4311ca04b2e 100644 (file)
--- a/xen/arch/arm/tee/Kconfig
+++ b/xen/arch/arm/tee/Kconfig
@@ -2,3 +2,8 @@ config OPTEE
        bool "Enable OP-TEE mediator"
        default n
        depends on TEE
+       help
+         Enable experimental OP-TEE mediator. It allows guests to access
+         OP-TEE running on your platform. This requires virtualization-enabled
+         OP-TEE present. You can learn more about virtualization for OP-TEE
+         at https://optee.readthedocs.io/architecture/virtualization.html