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    SubjectRe: [RFC PATCH v3] drivercore: Add driver probe deferral mechanism
    On Tue, Oct 4, 2011 at 8:51 AM, G, Manjunath Kondaiah <manjugk@ti.com> wrote:
    > On Thu, Sep 22, 2011 at 12:51:23PM -0600, Grant Likely wrote:
    >> Hi Manjunath,
    >>
    >> Here's the current state of the patch.  The major think that needs to
    >> be done is to convert it to use a separate workqueue as described in
    >> the TODO above.  It also needs some users adapted to it.  One of the
    >> gpio drivers would work; preferably one of the newer drivers that
    >> doesn't have a lot of drivers depending on the early_initcall()
    >> behaviour yet.
    >
    > I have tested this patch on omap3 beagle board by making:
    > 1. omap-gpio driver init as late_initcall instead of postcore_initcall
    > 2. mmc driver probe will request gpio through gpio_request and gpio driver
    > returns -EDEFER_PROBE which in turn makes mmc driver to request deferral probe.
    > 3. When deferral probe gets activated, it scans driver entries and it will not
    > find any match for mmc driver probe.

    Looks like drivers/mmc/host/omap.c is using platform_driver_probe()
    instead of platform_driver_register(). Add the probe hook to the
    platform_driver structure and change it to call
    platform_driver_register() and it should work. Don't forget to change
    mmc_omap_probe from __init to __devinit.

    g.
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