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Errata: The ptp_clock_hi rollsover to zero one clock cycle before it reaches one second boundary. As a result, the pps threshold comparison fails after one second and the pps output signal won't toggle further. This patch workarounds the issue by programming the pps_lo_incr register to 500msec minus one clock cycle period, ensuring that the pps threshold comparison succeeds at one second rollover boundary and pps edge toggles. After that point, the driver will have enough time (~500msec) to reset the pps threshold value. After each one second boundary, hrtimer is invoked which resets the pps threshold value. Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com> Signed-off-by: Rakesh Babu Saladi <rsaladi2@marvell.com> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com> 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.