From: Ben Hutchings <bhutchings@solarflare.com>
Date: Mon, 3 Sep 2012 10:34:58 +0000 (+0100)
Subject: pps/ptp: Allow PHC devices to adjust PPS events for known delay
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~132^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=220a60a425146b0e37998cc0b3082f0541aad866;p=pandora-kernel.git

pps/ptp: Allow PHC devices to adjust PPS events for known delay

Initial version by Stuart Hodgson <smhodgson@solarflare.com>

Some PHC device drivers may deliver PPS events with a significant
and variable delay, but still be able to measure precisely what
that delay is.

Add a pps_sub_ts() function for subtracting a delay from the
timestamp(s) in a PPS event, and a PTP event type (PTP_CLOCK_PPSUSR)
for which the caller provides a complete PPS event.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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