From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Likely Subject: Re: HOWTO Undo/Revert of_platform_populate? Date: Mon, 15 Apr 2013 14:40:09 +0100 Message-ID: <20130415134009.0A70E3E0AA8@localhost> References: <51392BD9.4010209@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51392BD9.4010209-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: Rob Herring , Ricardo Ribalda Delgado Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, LKML List-Id: devicetree@vger.kernel.org On Thu, 07 Mar 2013 18:07:53 -0600, Rob Herring wrote: > On 03/07/2013 04:32 AM, Ricardo Ribalda Delgado wrote: > > Hi > > > > I have an FPGA attached to the pci bus. The FPGA has an internal bus > > with multiple cores that are already supported in the kernel. > > > > I have made a driver that populates those cores using a user provided > > device tree. I use the function of_platform_populate for that. > > > > All this is working fine, but now I need a method to undo what > > of_platform_populate does when the fpga is reprogrammed. > > > > I haven't found any function that does this in the api. > > > > Before implementing my own I would like to know if am I missing something? > > It's not possible in the current kernel. You need DT overlay support > that was posted recently. In the mean time you can merely recurse all the children of the parent struct device, unregister them from the device model, and release them. g.