.. SPDX-License-Identifier: GPL-2.0 ===============================================TEE (Trusted Execution Environment) driver API=============================================== Kernel provides a TEE bus infrastructure where a Trusted Application isrepresented as a device identified via Universally Unique Identifier (UUID) andclient drivers register a table of supported device UUIDs. TEE bus infrastructure registers following APIs: match():  iterates over the client driver UUID table to find a corresponding  match for device UUID. If a match is found, then this particular device is  probed via corresponding probe API registered by the client driver. This  process happens whenever a device or a client driver is registered with TEE  bus. uevent():  notifies user-space (udev) whenever a new device is registered on  TEE bus for auto-loading of modularized client drivers. TEE bus device enumeration is specific to underlying TEE implementation, so itis left open for TEE drivers to provide corresponding implementation. Then TEE client driver can talk to a matched Trusted Application using APIslisted in include/linux/tee_drv.h. TEE client driver example------------------------- Suppose a TEE client driver needs to communicate with a Trusted Applicationhaving UUID: ``ac6a4085-0e82-4c33-bf98-8eb8e118b6c2``, so driver registrationsnippet would look like:: 	static const struct tee_client_device_id client_id_table[] = {		{UUID_INIT(0xac6a4085, 0x0e82, 0x4c33,			   0xbf, 0x98, 0x8e, 0xb8, 0xe1, 0x18, 0xb6, 0xc2)},		{}	}; 	MODULE_DEVICE_TABLE(tee, client_id_table); 	static struct tee_client_driver client_driver = {		.probe		= client_probe,		.remove		= client_remove,		.id_table	= client_id_table,		.driver		= {			.name		= DRIVER_NAME,		},	}; 	module_tee_client_driver(client_driver);