linux-kernel - Re: [PATCH 2/2] of: use platform_device

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Date:	Sun, 17 Feb 2013 15:43:20 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] of: use platform_device_add

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.

Shawn

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