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:

quoted

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.

Shawn