linux-kernel - Re: [PATCH] of: Have of_device_add call platform_device_add rather than device

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Date:	Mon, 26 Nov 2012 15:28:48 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss <devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH] of: Have of_device_add call platform_device_add rather than device_add

On Thu, 22 Nov 2012 10:30:20 -0700, Jason Gunthorpe <jgunthorpe@...idianresearch.com> wrote:
> 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@...00 {
>                         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@...00000/gpio@...00
>   f1010100-f1010103 : /internal@...00000/chip_cfg@0
> 
> What did you try? Maybe order matters?

(Sorry for not replying to my own mail; I'm doing this offline and my
sent mail doesn't show)

Looks like it is by design. With my dummy devices I see this:

10200c00-102023ff : /amba/overlap@...00c00
  10201000-10201fff : /amba/dummy@...01000
    10201400-10201bff : /amba/overlap@...01400

All three of those devices are siblings in the device tree.

g.
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