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The perout function is used to generate a 1PPS signal, synchronized to the PHC. This is accomplished by a using the hardware oneshot functionality, which is reset by a timer. The external timestamp function is set up for a 1PPS input pulse, and uses a timer to poll for temestamps. Both functions use the SYNC_OUT/SYNC_IN1 pin, so cannot run simultaneously. Co-developed-by: Lasse Johnsen <l@ssejohnsen.me> Signed-off-by: Lasse Johnsen <l@ssejohnsen.me> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| .mailmap | ||
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| README | ||
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.