Drivers like the S3C2410-ts.c must be added to the drivers/touchscreen directory and configured via the Kconfig and Makefile systems.
The term refers to a specific architectural pattern where the vis subsystem manages a Delta Driver . In software engineering, a "Delta Driver" is a driver that does not re-initialize the entire hardware stack on every change but rather computes the difference (delta) between the current hardware state and the requested state, applying only incremental changes. -vis On S3c2410x Delta Driver -
: Facilitates booting from high-density storage. The "@vis" Driver and Delta Electronics Drivers like the S3C2410-ts