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Vladimir Oltean says: ==================== Fully describe the waveform for PTP periodic output While using the ancillary pin functionality of PTP hardware clocks to synchronize multiple DSA switches on a board, a need arised to be able to configure the duty cycle of the master of this PPS hierarchy. Also, the PPS master is not able to emit PPS starting from arbitrary absolute times, so a new flag is introduced to support such hardware without making guesses. With these patches, struct ptp_perout_request now basically describes a general-purpose square wave. Changes in v2: Made sure this applies to net-next. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.