[PATCH v2] powerpc: Add dma nodes to 83xx, 85xx and 86xx boards
Kumar Gala
galak at kernel.crashing.org
Tue Jul 1 01:38:03 EST 2008
On Jun 30, 2008, at 10:35 AM, Scott Wood wrote:
> On Mon, Jun 30, 2008 at 02:15:25PM +1000, David Gibson wrote:
>> On Fri, Jun 27, 2008 at 04:10:17PM -0500, Kumar Gala wrote:
>>> Added DMA nodes for the elo/elo-plus DMA engines.
>>>
>>> Renamed the interrupt controller alias in mpc832x_rdb.dts to ipic
>>> so that
>>> its the same as all the other boards.
>>>
>>> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
>>
>> [snip]
>>> diff --git a/arch/powerpc/boot/dts/asp834x-redboot.dts b/arch/
>>> powerpc/boot/dts/asp834x-redboot.dts
>>> index 972cf78..8b1bb0e 100644
>>> --- a/arch/powerpc/boot/dts/asp834x-redboot.dts
>>> +++ b/arch/powerpc/boot/dts/asp834x-redboot.dts
>>> @@ -118,6 +118,41 @@
>>> mode = "cpu";
>>> };
>>>
>>> + dma at 82a8 {
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> + compatible = "fsl,mpc8347-dma", "fsl,elo-dma";
>>> + reg = <0x82a8 4>;
>>> + ranges = <0 0x8100 0x1a8>;
>>> + interrupt-parent = <&ipic>;
>>> + interrupts = <71 8>;
>>> + cell-index = <0>;
>>
>> What's the cell-index in these nodes used to index? Given the
>> confusion there's been about the proper use of this property, a
>> comment indicating which shared registers this is used to index is
>> probably a good idea.
>
> There's supposed to be a cell-index in the *channels* to index into
> the
> shared summary register (the "reg" of the dma node itself). I don't
> see any
> purpose for a cell-index in the main dma node, though.
I believe this comes into play when we have more than one DMA
controller and sometimes there are special uses like on 8610.
- k
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