HOWTO Undo/Revert of_platform_populate?

HOWTO Undo/Revert of_platform_populate?

[Ricardo Ribalda Delgado]

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?


Thanks!

-- 
Ricardo Ribalda

Re: HOWTO Undo/Revert of_platform_populate?

[Rob Herring]

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.

Rob

Re: HOWTO Undo/Revert of_platform_populate?

[Grant Likely]

On Thu, 07 Mar 2013 18:07:53 -0600, Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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.