On Thursday 16 December 2010, Richard Cochran wrote:

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 <redacted>

Looks fine to me, with one tiny comment:

+
+/* private globals */
+
+extern struct device_attribute ptp_dev_attrs[]; /* see ptp_sysfs.c */

The declaration is in a C file, better move it into a header in order
to make sure the definition matches the declaration.

	Arnd