Variable Clock Frequency and Power Saving

Werner Almesberger werner at openmoko.org
Wed Nov 5 14:58:29 CET 2008


Jonas Bonn wrote:
> + * ******FIXME******: select good errno's to return for these cases

Always a fun thing to do :-) How about these ?

> + * -EWAIT_FOR_NOTIFCATION : the clock frequency must be adjusted to meet the
> + *  		device constraints; the device can consider itself engaged to
> + *  		the clock, but should wait for a frequency change notification
> + *  		before enabling itself

-EINPROGRESS

> + * -EANOTHER_DEVICE_PREVENTS_ENGAGEMENT: another device is already
> engaged to the
> + *  		clock with constraints that do not intersect with this
> + *  		device's constraints; it will be impossible to engage at
> + *  		this time and the device remains unengaged (the device can
> + *  		change its constraints and try again, if the device spec
> + *  		allows)

-EBUSY

- Werner



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