773bda9649
The OpenCompute timecard driver has additional functionality besides a clock. Make the following resources available: - The external timestamp channels (ts0/ts1) - devlink support for flashing and health reporting - GPS and MAC serial ports - board serial number (obtained from i2c device) Also add watchdog functionality for when GNSS goes into holdover. The resources are collected under a timecard class directory: [jlemon@timecard ~]$ ls -g /sys/class/timecard/ocp1/ total 0 -r--r--r--. 1 root 4096 Aug 3 19:49 available_clock_sources -rw-r--r--. 1 root 4096 Aug 3 19:49 clock_source lrwxrwxrwx. 1 root 0 Aug 3 19:49 device -> ../../../0000:04:00.0/ -r--r--r--. 1 root 4096 Aug 3 19:49 gps_sync lrwxrwxrwx. 1 root 0 Aug 3 19:49 i2c -> ../../xiic-i2c.1024/i2c-2/ drwxr-xr-x. 2 root 0 Aug 3 19:49 power/ lrwxrwxrwx. 1 root 0 Aug 3 19:49 pps -> ../../../../../virtual/pps/pps1/ lrwxrwxrwx. 1 root 0 Aug 3 19:49 ptp -> ../../ptp/ptp2/ -r--r--r--. 1 root 4096 Aug 3 19:49 serialnum lrwxrwxrwx. 1 root 0 Aug 3 19:49 subsystem -> ../../../../../../class/timecard/ lrwxrwxrwx. 1 root 0 Aug 3 19:49 ttyGPS -> ../../tty/ttyS7/ lrwxrwxrwx. 1 root 0 Aug 3 19:49 ttyMAC -> ../../tty/ttyS8/ -rw-r--r--. 1 root 4096 Aug 3 19:39 uevent The labeling is needed at the minimum, in order to tell the serial devices apart. Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.