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    SubjectRe: [RFC/PATCH 1/5] usb: otg: add notifier support
    On Tue, Jan 26, 2010 at 03:16:20AM -0800, David Brownell wrote:

    > I'd vote to convert all the USB-to-charger interfaces so
    > they use notifiers. After fixing the events ... see
    > comments below. :)

    Yes please - it's not just chargers either, this can also be used by
    PMICs which do power path management that includes USB.

    > Those seem like the wrong events. The right events for a charger
    > would be more along the lines of:

    > - For peripheral: "you may use N milliAmperes now".
    > - General: "Don't Charge" (a.k.a. "use 0 mA").

    > I don't see how "N" would be passed with those events ...

    These are good for the peripheral side. You do get to pass a void *
    along with the notifier value, that could be used to pass data like the
    current limit.

    > A host *might* want to be able to say things like "supply
    > up to N milliAmperes now", e.g. to let a regulator choose
    > the most efficient mode.

    Yes, they definitely want this - not just for efficiency but also to
    allow current limiting to protect the system from excessive current

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      Last update: 2010-01-26 14:15    [W:0.020 / U:3.164 seconds]
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