On Wed, Feb 15, 2012 at 02:38:04PM +0100, Peter Zijlstra wrote: > On Sat, 2012-02-11 at 15:33 +0000, Mark Brown wrote: > > There's use cases for having this > > stuff offloaded but if you're not doing that stuff then why deal with > > the complication of designing the hardware? > Because doing it in software is more expensive? > Penny-wise pound-foolish like thing.. you make the software requirements > more complex, which results in more bugs (more cost in debugging), more > runtime (for doing the 'software' thing), less power savings. > Esp since all this uC/system-controller stuff is already available and > validated. It's really not - like I say most of the times people have tried to deploy this on embedded systems it's just made everyone more miserable and typically winds up getting turned off or bypassed. The PMICs are much more decoupled from the CPUs and the power control on the SoCs is more fine grained than you seem to see in the desktop market. There's software effort but people are willing to spend that for microamps and all other things being equal they'd typically rather spend it in the software stack they're already working with rather than in a separate stack for a microcontroller.
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