Re: [PATCH v2] platform: Make platform_bus device a platform device

[Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>]

On Tue, 2014-07-22 at 18:10 +0100, Greg Kroah-Hartman wrote:
> On Tue, Jul 22, 2014 at 11:02:07AM +0100, Pawel Moll wrote:
> > ... describing the root of the device tree, so one can write
> > a platform driver initializing the platform.
> > 
> > All references to platform_bus device have been fixed up,
> > although in most cases they could be simply removed or
> > replaced by NULL (platform devices with no parent are adopted
> > by main platform_bus device automagically).
> 
> In looking at this some more, I think all of these should be made NULL,
> why are we exporting this symbol at all?

I think there are about 3 non-obvious uses of it, which would probably
need looking into. All other ones that simply do of_platform_populate()
or platform_device_register*() with platform_bus as a parent, which has
exactly the same effect as it was NULL.

I can imagine situations where one would want to walk the device
hierarchy stopping at platform_bus, how I'm not sure how "legitimate"
that would be.

I'll post v3 with NULLs where I think it is enough so we can see the
other cases.

Pawel