[PATCH 4.19 042/109] ptp: ptp_clock: Publish scaled_ppm_to_ppb

[Sasha Levin]

From: Shalom Toledo <shalomt@xxxxxxxxxxxx>

[ Upstream commit 4368dada5b37e74a13b892ca5cef8a7d558e9a5f ]

Publish scaled_ppm_to_ppb to allow drivers to use it.

Signed-off-by: Shalom Toledo <shalomt@xxxxxxxxxxxx>
Reviewed-by: Petr Machata <petrm@xxxxxxxxxxxx>
Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/ptp/ptp_clock.c          | 3 ++-
 include/linux/ptp_clock_kernel.h | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index e232233beb8f..863958f3bb57 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -76,7 +76,7 @@ static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
 	spin_unlock_irqrestore(&queue->lock, flags);
 }
 
-static s32 scaled_ppm_to_ppb(long ppm)
+s32 scaled_ppm_to_ppb(long ppm)
 {
 	/*
 	 * The 'freq' field in the 'struct timex' is in parts per
@@ -95,6 +95,7 @@ static s32 scaled_ppm_to_ppb(long ppm)
 	ppb >>= 13;
 	return (s32) ppb;
 }
+EXPORT_SYMBOL(scaled_ppm_to_ppb);
 
 /* posix clock implementation */
 
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 51349d124ee5..40ea83fcfdd5 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -204,6 +204,14 @@ extern void ptp_clock_event(struct ptp_clock *ptp,
 
 extern int ptp_clock_index(struct ptp_clock *ptp);
 
+/**
+ * scaled_ppm_to_ppb() - convert scaled ppm to ppb
+ *
+ * @ppm:    Parts per million, but with a 16 bit binary fractional field
+ */
+
+extern s32 scaled_ppm_to_ppb(long ppm);
+
 /**
  * ptp_find_pin() - obtain the pin index of a given auxiliary function
  *
-- 
2.30.2