This patch adds an infrastructure for hardware clocks that implement
IEEE 1588, the Precision Time Protocol (PTP). A class driver offers a
registration method to particular hardware clock drivers. Each clock is
presented as a standard POSIX clock.
The ancillary clock features are exposed in two different ways, via
the sysfs and by a character device.
Signed-off-by: Richard Cochran <email@example.com>
Acked-by: Arnd Bergmann <firstname.lastname@example.org>
Acked-by: David S. Miller <email@example.com>
Signed-off-by: John Stultz <firstname.lastname@example.org>