[RFC][POWERPC] Add arch/powerpc 4xx NDFC (NAND) support

[Valentine Barshak]

Stefan Roese wrote:
> diff --git a/arch/powerpc/boot/dts/sequoia.dts b/arch/powerpc/boot/dts/sequoia.dts
> index 36be75b..9b15482 100644
> --- a/arch/powerpc/boot/dts/sequoia.dts
> +++ b/arch/powerpc/boot/dts/sequoia.dts
> @@ -122,6 +122,38 @@
>  			interrupt-map-mask = <ffffffff>;
>  		};
>  
> +		ndfc at 1d0000000, {
> +			device_type = "nand";
> +			compatible = "ibm,ndfc";
> +			reg = <1 d0000000 2000>;

I think this should be handled the way it's done for nor flash, since 
ndfc is relocatable within EBC address space.

Thanks,
Valentine.