Messages in this thread | | | From | David Brownell <> | Subject | Re: [RFC/PATCH 1/5] usb: otg: add notifier support | Date | Tue, 26 Jan 2010 07:21:28 -0800 |
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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".
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.
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