linux-kernel - Re: HOWTO Undo/Revert of_platform

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Message-Id: <20130415134009.0A70E3E0AA8@localhost>
Date:	Mon, 15 Apr 2013 14:40:09 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Rob Herring <robherring2@...il.com>,
	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: HOWTO Undo/Revert of_platform_populate?

On Thu, 07 Mar 2013 18:07:53 -0600, Rob Herring <robherring2@...il.com> 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.

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