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Update and check functionality for pin configuration requests: PTP_PF_NONE: requests "IN: None", disabling the pin. # testptp -d /dev/ptp3 -L3,0 -i1 set pin function okay # cat sma4 IN: None PTP_PF_EXTTS: should configure external timestamps, but since the timecard can steer inputs to multiple inputs as well as timestamps, allow the request, but don't change configurations. # testptp -d /dev/ptp3 -L3,1 -i1 set pin function okay (no functional or configuration change here yet) PTP_PF_PEROUT: Channel 0 is the PHC, at 1PPS. Channels 1-4 are the programmable frequency generators. # fails because period is not 1PPS. # testptp -d /dev/ptp3 -L3,2 -i0 -p 500000000 PTP_PEROUT_REQUEST: Invalid argument # testptp -d /dev/ptp3 -L3,2 -i0 -p 1000000000 periodic output request okay # cat sma4 OUT: PHC # testptp -d /dev/ptp3 -L3,2 -i1 -p 500000000 -w 200000000 periodic output request okay # cat sma4 OUT: GEN1 # cat gen1/signal 500000000 40 0 1 2022-03-10T23:55:26 TAI # cat gen1/running 1 # testptp -d /dev/ptp3 -L3,2 -i1 -p 0 periodic output request okay # cat gen1/running 0 Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> Link: https://lore.kernel.org/r/20220315194626.1895-1-jonathan.lemon@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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.