Bryan O'Donoghue 6da7c88972 greybus: tracepoints: Add standard Linux tracepoint for TimeSync event ... This patch adds a tracepoint to the TimeSync ISR, the purpose of which is to indicate a TimeSync event has happened. This tracepoint can be enabled by issuing the following command: echo 1 > /sys/kernel/debug/tracing/events/greybus/gb_timesync_irq/enable Synchronization looks like this: TIMESTAMP FUNCTION | | 147.865788: gb_timesync_irq: strobe 1/4 frame-time 2910076529 147.866781: gb_timesync_irq: strobe 2/4 frame-time 2910095689 147.867777: gb_timesync_irq: strobe 3/4 frame-time 2910114820 147.868791: gb_timesync_irq: strobe 4/4 frame-time 2910134038 A ping can be triggered like this: cat /sys/kernel/debug/greybus/frame-time And that ping looks like this: TIMESTAMP FUNCTION | | 147.934678: gb_timesync_irq: ping 4/4 frame-time 2911380356 169.280551: gb_timesync_irq: ping 4/4 frame-time 3321221069 Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Reviewed-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Acked-by: Alex Elder <elder@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>		2016-06-06 20:50:08 -07:00
drivers/staging/greybus	greybus: tracepoints: Add standard Linux tracepoint for TimeSync event	2016-06-06 20:50:08 -07:00