ARM/DT: registering clks from DT in .init_early

ARM/DT: registering clks from DT in .init_early

[Jamie Iles]

I'm currently working on moving our platform to device tree with the aim 
of mainlining it.  Before device tree we registered the clks in the 
.init_early machine callback which is fine as the clks are static data.  
I'm now trying to dynamically register these clks from the device tree 
but the slab allocator isn't available at this stage so I can't allocate 
them dynamically.

Am I heading in the wrong direction here?  We currently get the 
clocksource and clock event frequency from a clk so I don't think this 
can be made later (though I guess this could come from device tree 
instead).

Jamie

ARM/DT: registering clks from DT in .init_early

[Jamie Iles]

On Thu, Jun 09, 2011 at 05:45:57PM +0100, Jamie Iles wrote:
> I'm currently working on moving our platform to device tree with the aim 
> of mainlining it.  Before device tree we registered the clks in the 
> .init_early machine callback which is fine as the clks are static data.  
> I'm now trying to dynamically register these clks from the device tree 
> but the slab allocator isn't available at this stage so I can't allocate 
> them dynamically.
> 
> Am I heading in the wrong direction here?  We currently get the 
> clocksource and clock event frequency from a clk so I don't think this 
> can be made later (though I guess this could come from device tree 
> instead).

OK, I found http://permalink.gmane.org/gmane.linux.ports.arm.kernel/105261
which describes the issue.  I've changed to alloc_bootmem() which Grant 
suggested in that thread and that does resolve the crash, however 
of_clk_add_provider() uses kzalloc() and I can't help but feel that it's 
going to get a bit too messy doing it this way.

Jamie