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

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Date:	Wed, 21 Nov 2012 16:05:23 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	devicetree-discuss <devicetree-discuss@...ts.ozlabs.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] of: Have of_device_add call platform_device_add rather
 than device_add

On Wed, Nov 21, 2012 at 3:51 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Wed, 21 Nov 2012 00:24:48 -0700, Jason Gunthorpe <jgunthorpe@...idianresearch.com> 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.
>>
>> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
>> ---
>>  drivers/of/device.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> Tested on PPC32 and ARM32 embedded kernels.
>>
>> diff --git a/drivers/of/device.c b/drivers/of/device.c
>> index 4c74e4f..a5b67dc 100644
>> --- a/drivers/of/device.c
>> +++ b/drivers/of/device.c
>> @@ -62,7 +62,7 @@ int of_device_add(struct platform_device *ofdev)
>>       if (!ofdev->dev.parent)
>>               set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
>>
>> -     return device_add(&ofdev->dev);
>> +     return platform_device_add(ofdev);
>>  }
>>
>>  int of_device_register(struct platform_device *pdev)
>
> This has the side effect of moving all devices at the root of the tree
> from /sys/devices/ to /sys/devices/platform. It also has the possibility
> of breaking if any devices get registered with overlapping regions. I
> think there are some powerpc 5200 boards that do this, and I'm not sure
> about the larger Power boxen.
>
> I've got a more nuanced version of this patch that I'm trying to get
> published today for review. I'll add you to the cc list.

However, while on this topic;

Ben. Do you have any objections to registering all OF generated
platform devices under /sys/devices/platform instead of /sys/devices?
I don't much like the platform directory, but it would make the code
more consistent for DT and non-DT users.

g.

--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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