How to ensure clock is updated in a device driver

[Jerry Stuckle <jstuckle@attglobal.net>]

Hi, all,

I'm working on a driver to monitor a device.  One of the things I need 
is an accurate time, and ARM clocks are notoriously subject to drift. 
Once the system is booted, that's not a problem as I can use an ntp 
server in a cron job to correct the time as necessary.

However, I need the time to be accurate during device driver 
initialization, also.  How can I ensure ntp has run to update the system 
clock during initialization?

TIA.

Jerry