KEY_F21           272 include/dt-bindings/input/linux-event-codes.h #define KEY_F21			191
KEY_F21           272 include/uapi/linux/input-event-codes.h #define KEY_F21			191
KEY_F21           272 scripts/dtc/include-prefixes/dt-bindings/input/linux-event-codes.h #define KEY_F21			191