Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755444Ab2KURo6 (ORCPT ); Wed, 21 Nov 2012 12:44:58 -0500 Received: from quartz.orcorp.ca ([184.70.90.242]:36203 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754273Ab2KURo5 (ORCPT ); Wed, 21 Nov 2012 12:44:57 -0500 Date: Wed, 21 Nov 2012 10:44:53 -0700 From: Jason Gunthorpe To: Grant Likely Cc: linux-kernel@vger.kernel.org, Rob Herring , Greg Kroah-Hartman , devicetree-discuss@lists.ozlabs.org Subject: Re: [PATCH] of: Have of_device_add call platform_device_add rather than device_add Message-ID: <20121121174453.GD6406@obsidianresearch.com> References: <20121121072448.GG19837@obsidianresearch.com> <20121121155104.726B83E0AE2@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121121155104.726B83E0AE2@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) X-Broken-Reverse-DNS: no host name found for IP address 10.0.0.162 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2508 Lines: 69 On Wed, Nov 21, 2012 at 03:51:04PM +0000, Grant Likely wrote: > On Wed, 21 Nov 2012 00:24:48 -0700, Jason Gunthorpe 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 > > 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 > > +++ 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. Okay, I'll try to test your patch. I know sensible overlapping seems to work: e0000000-e7ffffff : PCIe 0 MEM e0000000-e000ffff : 0000:00:01.0 e0000000-e0000fff : /pex@e0000000/chip@0/chip_control@0 e0000008-e000000b : dat e0000008-e000000b : dat e000000c-e000000f : set e000000c-e000000f : set e0000010-e0000013 : dirin e0000010-e0000013 : dirin Which is nesting the generic gpio driver under a larger region.. And: f1010100-f101013f : /internal@f1000000/gpio@10100 f1010100-f1010103 : /internal@f1000000/chip_cfg@0 Which is nesting a register set for one OF platform_device under another. It seems to be handled automatically. My motivations are two fold: - Having a mostly empty /proc/iomem isn't great for diagnostics - I'll send a patch today that adds some more code to platform_device_add Thanks Grant, Jason -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/