Flexcan - timestamp from message buffer to userspace

[Martin Kozusky <mkozusky@kkmicro.cz>]

Hello,
is there any official way how to read timestamp from flexcans message 
buffer?
I see there is a macro defined FLEXCAN_MB_CNT_TIMESTAMP in flexcan.c, 
but not used.
I would modify function flecan_read_fifo like

+ u32 timestamp = FLEXCAN_MB_CNT_TIMESTAMP(reg_ctrl);

but what to do with timestamp variable next and how to read it in 
userspace? :) I could change structure can_frame and add  u32 timestamp 
into it, but it wouldn't be very nice hack I think.

BTW: is timestamp read with SO_TIMESTAMP  actualy taken when CAN message 
arrives?

Thanks,
Martin