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authorRichard Cochran <richardcochran@gmail.com>2011-04-22 14:03:08 +0400
committerJohn Stultz <john.stultz@linaro.org>2011-05-24 00:01:00 +0400
commitd94ba80ebbea17f036cecb104398fbcd788aa742 (patch)
tree7fe40228c5ea2bb77f2892b722d27155df8c1157 /drivers/ptp/Kconfig
parentcaebc160ce3f76761cc62ad96ef6d6f30f54e3dd (diff)
downloadlinux-d94ba80ebbea17f036cecb104398fbcd788aa742.tar.xz
ptp: Added a brand new class driver for ptp clocks.
This patch adds an infrastructure for hardware clocks that implement IEEE 1588, the Precision Time Protocol (PTP). A class driver offers a registration method to particular hardware clock drivers. Each clock is presented as a standard POSIX clock. The ancillary clock features are exposed in two different ways, via the sysfs and by a character device. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/ptp/Kconfig')
-rw-r--r--drivers/ptp/Kconfig30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
new file mode 100644
index 000000000000..70d4bb1cbdab
--- /dev/null
+++ b/drivers/ptp/Kconfig
@@ -0,0 +1,30 @@
+#
+# PTP clock support configuration
+#
+
+menu "PTP clock support"
+
+comment "Enable Device Drivers -> PPS to see the PTP clock options."
+ depends on PPS=n
+
+config PTP_1588_CLOCK
+ tristate "PTP clock support"
+ depends on EXPERIMENTAL
+ depends on PPS
+ help
+ The IEEE 1588 standard defines a method to precisely
+ synchronize distributed clocks over Ethernet networks. The
+ standard defines a Precision Time Protocol (PTP), which can
+ be used to achieve synchronization within a few dozen
+ microseconds. In addition, with the help of special hardware
+ time stamping units, it can be possible to achieve
+ synchronization to within a few hundred nanoseconds.
+
+ This driver adds support for PTP clocks as character
+ devices. If you want to use a PTP clock, then you should
+ also enable at least one clock driver as well.
+
+ To compile this driver as a module, choose M here: the module
+ will be called ptp.
+
+endmenu