Some PTP Hardware Clock drivers use a struct timecounter to represent
their clock. To adjust the time by a given offset, these drivers all
perform a two step read/write of their timecounter. However, it is
better and simpler just to adjust the offset in one step. This patch
introduces a little routine to help drivers implement the adjtime
method.
Suggested-by: Janusz Użycki <j.uzy...@elproma.com.pl>
Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
include/linux/timecounter.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/timecounter.h b/include/linux/timecounter.h
index 146f07a..af3dfa4 100644
--- a/include/linux/timecounter.h
+++ b/include/linux/timecounter.h
@@ -79,6 +79,15 @@ static inline u64 cyclecounter_cyc2ns(const struct
cyclecounter *cc,
}
/**
+ * timecounter_adjtime - Shifts the time of the clock.
+ * @delta: Desired change in nanoseconds.
+ */
+static inline void timecounter_adjtime(struct timecounter *tc, s64 delta)
+{
+ tc->nsec += delta;
+}
+
+/**
* timecounter_init - initialize a time counter
* @tc: Pointer to time counter which is to be
initialized/reset
* @cc: A cycle counter, ready to be used.
--
1.7.10.4
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