Re: [PATCH 2/2] of: use platform_device_add

From: Shawn Guo
Date: Sun Feb 17 2013 - 02:43:31 EST

On Sun, Feb 17, 2013 at 11:03:35AM +0800, Shawn Guo wrote:
> On Fri, Jan 18, 2013 at 01:40:00AM +0000, Grant Likely wrote:
> > This allows platform_device_add a chance to call insert_resource on all
> > of the resources from OF. At a minimum this fills in proc/iomem and
> > presumably makes resource tracking and conflict detection work better.
> > However, it has the side effect of moving all OF generated platform
> > devices from /sys/devices to /sys/devices/platform/. It /shouldn't/
> > break userspace because userspace is not supposed to depend on the full
> > path (because userspace always does what it is supposed to, right?).
> >
> > This may cause breakage if either:
> > 1) any two nodes in a given device tree have overlapping & staggered
> > regions (ie. 0x80..0xbf and 0xa0..0xdf; where one is not contained
> > within the other). In this case one of the devices will fail to
> > register and an exception will be needed in platform_device_add() to
> > complain but not fail.
> Grant,
> The patch introduce a regression on imx6q boot.

It also breaks all of_amba_device users.

of_amba_device_create() --> amba_device_add() --> request_resource()
and fails.


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