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| author | Kent Gibson <warthog618@gmail.com> | 2020-10-15 02:11:56 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-12-06 01:22:47 +0300 |
| commit | 26d060e47e25f2c715a1b2c48fea391f67907a30 (patch) | |
| tree | 084ae8859583599fbf3f8ee1c7f9a472dc5eaaf2 /drivers/gpio/gpiolib.h | |
| parent | 93224edf0b9fd7f643e7ead5b683bdac87f20aa2 (diff) | |
| download | linux-26d060e47e25f2c715a1b2c48fea391f67907a30.tar.xz | |
gpiolib: cdev: allow edge event timestamps to be configured as REALTIME
Using CLOCK_REALTIME as the source for event timestamps is crucial for
some specific applications, particularly those requiring timetamps
relative to a PTP clock, so provide an option to switch the event
timestamp source from the default CLOCK_MONOTONIC to CLOCK_REALTIME.
Note that CLOCK_REALTIME was the default source clock for GPIO until
Linux 5.7 when it was changed to CLOCK_MONOTONIC due to issues with the
shifting of the realtime clock.
Providing this option maintains the CLOCK_MONOTONIC as the default,
while also providing a path forward for those dependent on the pre-5.7
behaviour.
Suggested-by: Jack Winch <sunt.un.morcov@gmail.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20201014231158.34117-2-warthog618@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 42d81454da21..9c32d4ace572 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -116,6 +116,7 @@ struct gpio_desc { #define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */ #define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */ #define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */ +#define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */ /* Connection label */ const char *label; |