Re: [RFC][PATCH 2/5] driver core: Functional dependencies tracking support

[Mark Brown]

On Wed, Jun 08, 2016 at 08:12:34PM +0200, Rafael J. Wysocki wrote:
> On Wed, Jun 8, 2016 at 2:48 PM, Mark Brown <broonie@xxxxxxxxxx> wrote:
> > On Thu, Jan 14, 2016 at 02:54:17AM +0100, Rafael J. Wysocki wrote:

> >> + * A side effect of the link creation is re-ordering of dpm_list and the
> >> + * devices_kset list by moving the consumer device and all devices depending
> >> + * on it to the ends of those lists.

> > How does this work in the scenario where a device instantiates a child
> > device then uses services that child provides to complete the
> > initializiation?  We do have that scenario currently for on chip
> > regulators to allow external regulators to be used.

> I'm not sure I understand the question correctly, but it that is the
> parent and a child, we don't need an extra link entity to represent
> that dependency, as parent-child dependencies are taken by the current
> code into account already.

A parent (especially a MFD) may create a child to fulfil a role that
could also be filled by a non-parent device, if that happens then
depending on what ends up creating these links (it's not 100% clear from
this series) it's likely that the link creation will also end up
registering a dependency unless we do something special.  Now I think
about it this does depend on how we create the children though, it's
less likely to be an issue if the dependencies are created by firmware
code.

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