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For some PTP devices, they have the capability to loop back the periodic output signal for debugging, such as the ptp_qoriq device. So add the generic interfaces to set the periodic output signal loopback, rather than each vendor having a different implementation. Show how many channels support the periodic output signal loopback: $ cat /sys/kernel/debug/ptp<N>/n_perout_loopback Enable the loopback of the periodic output signal of channel X: $ echo <X> 1 > /sys/kernel/debug/ptp<N>/perout_loopback Disable the loopback of the periodic output signal of channel X: $ echo <X> 0 > /sys/kernel/debug/ptp<N>/perout_loopback Suggested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Wei Fang <wei.fang@nxp.com> Link: https://patch.msgid.link/20250905030711.1509648-2-wei.fang@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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 reStructuredText 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.