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    SubjectRe: [PATCH] drivercore: Add driver probe deferral mechanism
    On Mon, Jul 04, 2011 at 10:41:26AM -0700, Greg KH wrote:

    > And why would a driver not be able to get all of the proper resources?

    If the resources are provided by another driver (for example, a clock,
    GPIO or regulator) then the driver doing the providing needs to have
    initialized before the resource can be used. Currently we have no way
    of ensuring that this happens.

    > Why can't a bus, at a later time, just try to reprobe everything when it
    > determines that it is a "later" time now, without having to do this
    > added change to the core?

    The buses can't do anything to help as they have no visibility of this
    and the chances are that devices on several different buses are

    > Why would drivers in modules be an issue? If a driver depends on
    > another driver, making it a module dependancy would solve the problem,
    > right?

    The general problem here is that the drivers depend on each other in
    system-specific fashions that have nothing to do with the control
    heirachy the device model uses - for example, a device may depend on
    having a clock provided but the specific clock used could come from
    essentially any device in a given system with the driver accessing that
    clock via the clock API which matches devices up with their providers.
    The API indirection means we can share code between systems but means
    that the kernel infrastructure has no visibility of the relationships.

     \ /
      Last update: 2011-07-04 19:59    [W:0.037 / U:26.592 seconds]
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