[PATCH v4 04/22] of: add function to allow probing a device from a OF node

[Mark Brown]

On Wed, Sep 16, 2015 at 10:17:43AM +0200, Tomeu Vizoso wrote:

> AFAICS, this is a must currently for correct operation in simple-bus
> and simple-mfd situations, because probing order is currently very
> unpredictable and it's totally possible for the probing of a child to
> start before the probing of its parent has finished (if async probing
> is enabled or if a module is loaded that registers a child's driver at
> the wrong time).

Hrm.  That's worrying for devices that rely on peering into their parent
device for things...

> I would prefer if the core would take care of making sure that parents
> are always probed before their children, but the unconditional locking
> of the parent device stands in the way.

In the MFD case this is another reason for not putting the device
structure into the DT - if it isn't then the ordering is controlled by
the device being instantiated.
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