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authorYangbo Lu <yangbo.lu@nxp.com>2021-06-30 11:11:57 +0300
committerDavid S. Miller <davem@davemloft.net>2021-07-01 23:08:18 +0300
commit895487a3a10fb3a177e20dcde875515d46ccd4df (patch)
tree469a438e482937c6b59f1f9e74c4eda96aa84bbc /drivers/ptp
parentc156174a67070042d51d2c866146d3c934d5468c (diff)
downloadlinux-895487a3a10fb3a177e20dcde875515d46ccd4df.tar.xz
ptp: add kernel API ptp_convert_timestamp()
Add kernel API ptp_convert_timestamp() to convert raw hardware timestamp to a specified ptp vclock time. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp')
-rw-r--r--drivers/ptp/ptp_vclock.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index cefab29a0592..e0f87c57749a 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -183,3 +183,37 @@ out:
return num;
}
EXPORT_SYMBOL(ptp_get_vclocks_index);
+
+void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
+ int vclock_index)
+{
+ char name[PTP_CLOCK_NAME_LEN] = "";
+ struct ptp_vclock *vclock;
+ struct ptp_clock *ptp;
+ unsigned long flags;
+ struct device *dev;
+ u64 ns;
+
+ snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", vclock_index);
+ dev = class_find_device_by_name(ptp_class, name);
+ if (!dev)
+ return;
+
+ ptp = dev_get_drvdata(dev);
+ if (!ptp->is_virtual_clock) {
+ put_device(dev);
+ return;
+ }
+
+ vclock = info_to_vclock(ptp->info);
+
+ ns = ktime_to_ns(hwtstamps->hwtstamp);
+
+ spin_lock_irqsave(&vclock->lock, flags);
+ ns = timecounter_cyc2time(&vclock->tc, ns);
+ spin_unlock_irqrestore(&vclock->lock, flags);
+
+ put_device(dev);
+ hwtstamps->hwtstamp = ns_to_ktime(ns);
+}
+EXPORT_SYMBOL(ptp_convert_timestamp);