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ptp: ptp_clock: Publish scaled_ppm_to_ppb 

Publish scaled_ppm_to_ppb to allow drivers to use it.

Signed-off-by: Shalom Toledo <shalomt@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shalom Toledo 2019-06-11 18:45:09 +03:00 committed by David S. Miller
parent 1078645af6
commit 4368dada5b
2 changed files with 10 additions and 1 deletions
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3
drivers/ptp/ptp_clock.c
View File

@ -63,7 +63,7 @@ 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
@ -82,6 +82,7 @@ static s32 scaled_ppm_to_ppb(long ppm)
ppb >>= 13;
return (s32) ppb;
}
EXPORT_SYMBOL(scaled_ppm_to_ppb);
/* posix clock implementation */

8
include/linux/ptp_clock_kernel.h
View File

@ -212,6 +212,14 @@ 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
*