From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Subject: Re: [PATCH] of: Have of_device_add call platform_device_add rather
 than device_add
Date: Thu, 22 Nov 2012 10:30:20 -0700
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To: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Cc: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>, devicetree-discuss <devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
List-Id: devicetree@vger.kernel.org

On Thu, Nov 22, 2012 at 03:36:21PM +0000, Grant Likely wrote:

> Hmm... I've not tried it with assigned-address. I tried with two sibling
> platform devices using just the 'reg' property. That the kernel will
> complain about. For powerpc-only, the patch I posted allows the device
> to get registered anyway even though the range incorrectly overlaps.

My second example was done with the reg property..

                gpio0: gpio@10100 {
                        compatible = "marvell,orion-gpio";
                        #gpio-cells = <2>;
                        gpio-controller;
                        reg = <0x10100 0x40>;
                }
                chip_cfg@0 {
                        compatible = "orc,chip_config";
                        // Doubles up on gpio0
                        reg = <0x10100 0x4>;
                };


f1010100-f101013f : /internal@f1000000/gpio@10100
  f1010100-f1010103 : /internal@f1000000/chip_cfg@0

What did you try? Maybe order matters?

Regards,
Jason