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ptp: Introduce strict checking of external time stamp options.

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User space may request time stamps on rising edges, falling edges, or
both.  However, the particular mode may or may not be supported in the
hardware or in the driver.  This patch adds a "strict" flag that tells
drivers to ensure that the requested mode will be honored.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran
2019-11-14 10:45:02 -08:00
committed by David S. Miller
parent 592025a03b
commit 6138e687c7
7 changed files with 15 additions and 6 deletions
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3
drivers/net/dsa/mv88e6xxx/ptp.c
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@@ -276,7 +276,8 @@ static int mv88e6352_ptp_enable_extts(struct mv88e6xxx_chip *chip,
/* Reject requests with unsupported flags */
if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
PTP_RISING_EDGE |
PTP_FALLING_EDGE))
PTP_FALLING_EDGE |
PTP_STRICT_FLAGS))
return -EOPNOTSUPP;
pin = ptp_find_pin(chip->ptp_clock, PTP_PF_EXTTS, rq->extts.index);