Re: [RFC/PATCH 1/5] usb: otg: add notifier support

[Felipe Balbi]

On Tue, Jan 26, 2010 at 04:21:28PM +0100, ext David Brownell wrote:
> On Tuesday 26 January 2010, Felipe Balbi wrote:
> > >
> > >Thing is, supplying current is a bit more involved.  If the
> > >board can't supply 300 mA, the USB configuration selection
> > >mechanism has to know that, so it never selects peripheral
> > >configurations which require that much current.
> >
> > but that's done already by the usb core, no ? It rules out configuration
> > based on the hub->power_budget (can't remember if the field is that
> > exact name).
>
> Yes, it handles that ... but where does the power budget
> come from?  That's what I meant by "more involved".

we set it from board-files (on ARM, at least). It's a board 
characteristic, no ?

> As in, the host/supplying side of the power equation can't
> be event driven like the peripheral/consuming side can.
>
> And that's another reason I think it's best to fully solve
> the common (peripheral, recharge-that-batter) case first.

fair enough.

--
balbi
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