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This patch adds the kernel side of the PPS support currently named "LinuxPPS". PPS means "pulse per second" and a PPS source is just a device which provides a high precision signal each second so that an application can use it to adjust system clock time. Common use is the combination of the NTPD as userland program with a GPS receiver as PPS source to obtain a wallclock-time with sub-millisecond synchronisation to UTC. To obtain this goal the userland programs shoud use the PPS API specification (RFC 2783 - Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0) which in part is implemented by this patch. It provides a set of chars devices, one per PPS source, which can be used to get the time signal. The RFC's functions can be implemented by accessing to these char devices. Signed-off-by: Rodolfo Giometti <giometti@linux.it> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Greg KH <greg@kroah.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| debugfs-kmemtrace | ||
| debugfs-pktcdvd | ||
| ima_policy | ||
| procfs-diskstats | ||
| sysfs-block | ||
| sysfs-bus-css | ||
| sysfs-bus-pci | ||
| sysfs-bus-pci-devices-cciss | ||
| sysfs-bus-umc | ||
| sysfs-bus-usb | ||
| sysfs-bus-usb-devices-usbsevseg | ||
| sysfs-c2port | ||
| sysfs-class | ||
| sysfs-class-bdi | ||
| sysfs-class-pktcdvd | ||
| sysfs-class-regulator | ||
| sysfs-class-usb_host | ||
| sysfs-class-uwb_rc | ||
| sysfs-dev | ||
| sysfs-devices | ||
| sysfs-devices-cache_disable | ||
| sysfs-devices-memory | ||
| sysfs-firmware-acpi | ||
| sysfs-firmware-memmap | ||
| sysfs-firmware-sgi_uv | ||
| sysfs-fs-ext4 | ||
| sysfs-gpio | ||
| sysfs-ibft | ||
| sysfs-kernel-mm | ||
| sysfs-kernel-mm-hugepages | ||
| sysfs-kernel-slab | ||
| sysfs-kernel-uids | ||
| sysfs-ocfs2 | ||
| sysfs-power | ||
| sysfs-pps | ||
| sysfs-profiling | ||
| sysfs-wusb_cbaf | ||