[PATCH 06/14] ARM: kirkwood: convert uart0 to devicetree.

[Jason]

On Thu, Mar 08, 2012 at 02:32:44PM -0700, Grant Likely wrote:
> On Thu, Mar 08, 2012 at 02:47:25PM -0500, Jason wrote:
> > On Thu, Mar 08, 2012 at 08:27:11PM +0100, Thomas Gleixner wrote:
> > > On Thu, 8 Mar 2012, Arnd Bergmann wrote:
> > > 
> > > > On Thursday 08 March 2012, Jason wrote:
> > > > > 
> > > > > On Wed, Mar 07, 2012 at 09:13:04PM +0000, Arnd Bergmann wrote:
> > > > > > Finally, something could be wrong with the interrupt controller.
> > > > > > AFAICT, you register it through the device tree now, but it's also
> > > > > > getting initialized through kirkwood_init_irq, so the numbers
> > > > > > would all be wrong.
> > > > > 
> > > > > Yes, I'm working through this now.  mv_cesa silently fails to come up
> > > > > if it can't find the interrupt controller via fdt.  So, it needs to get
> > > > > done.
> > > > > 
> > > > > Right now, I'm looking at how mach-versatile does it (vic_init()) since
> > > > > it's also an ARM926ej-s...
> > > > > 
> > > > 
> > > > Ok, sounds good. It's not important whether it's an ARM9 or not btw.
> > > > You should look at both anything that defines an "interrupt-controller"
> > > > property as an example including Documentation/devicetree/bindings/arm/vic.txt
> > > > and Documentation/devicetree/bindings/arm/gic.txt.
> > > > 
> > > > (taking Thomas Gleixner on Cc)
> > > > 
> > > > Since the orion irq chip is based on irqchip_generic, it would be
> > > > perfect to have a generic irqchip binding to go along with
> > > > kernel/irq/generic-chip.c. Not sure if anyone has thought about this
> > > > before, but it looks like we can completely avoid using
> > > > arch/arm/plat-orion/irq.c and arch/arm/mach-kirkwood/irq.c if we
> > > > do that.
> > > 
> > > Right. That should be trivial to implement.
> > 
> > ok, I'm on it.  kernel/irq/of_generic_irq.c sound good?
> 
> Rob Herring has done some work in this area.  Please coordinate with him.

Rob,

I'm attempting to convert mach-kirkwood boards over to devicetree,
starting with the dreamplug.

You can find my stable patches here:

git://git.infradead.org/users/jcooper/linux-kirkwood.git kirkwood_dt_stable

and the stuff I'm still trying to figure out:

git://git.infradead.org/users/jcooper/linux-kirkwood.git kirkwood_dt_staging

My next task looks like converting the irq code, since mv_cesa fails
silently without the interrupt-controller specified in the dtb.

The code I'm replacing can be found here:

arch/arm/mach-kirkwood/irq.c
arch/arm/plat-orion/irq.c

This is the first time I've attempted something like this, so any
pointers would be much appreciated.  Also, if there is anything I would
need to deconflict with, please let me know.

thx,

Jason.