Re: [RFC PATCH 06/10] spi: add support for ACPI reconfigure notifications

[Mark Brown]

On Mon, Apr 04, 2016 at 10:34:56PM +0300, Octavian Purdila wrote:
> On Mon, Apr 4, 2016 at 7:03 PM, Mark Brown <broonie@xxxxxxxxxx> wrote:

> > Why is probe different to hotplug?  We don't need to do that in the
> > normal driver model.

> There might be some confusion with the term, I am referring to slave
> hotplug, not controller hotplug.

That's what I was talking about too.

> The way I see it, there are two logical operations: probe of a
> controller and the associated enumeration of the SPI slaves for that
> bus and "hotplug" of new SPI slaves and the enumeration of those
> particular slaves.

I don't see a distinction here.  The firmware finds some new slaves to
tell the framework about.  Quite why it decided to go looking shouldn't
matter.

> When a slave hotplug happens for device tree we get a device node
> notification and we can instantiate the SPI slave based on that info.
> In case of ACPI, (at this point) we get a global callback and in that
> callback we need to iterate through *all* controllers.

That's not really helping me understand why you need every bus to open
code enumeration twice?

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