imx28 kernel time stamp

[shashikanthirem]

Hi All.

i need to timer expiry calculation in micro sec, whose value is feed by user space using ioctl, but want to whats the best way to timestamp which is used in IRQ calls for example

serial_IRQ....{

// read byte for every byte

// get time stamp in usec ...???

}

1. this should take care of roll over

2. i am  using a do_gettimeofday() will it delay the irq ?

[igorpadykov]

Hi shashikant

one can look at answers provided on

i.mx28 system timer/clock problem 

c - reading the timestamp from kernel using procfs - where is it stored after reading from kernel? -... 

Best regards
igor
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