[alsa-devel] [PATCH 3/5 v7][RFC] ASoC: simple-card: add Device Tree support

Stephen Warren swarren at wwwdotorg.org
Thu Feb 28 20:16:05 CET 2013

On 02/27/2013 05:53 PM, Kuninori Morimoto wrote:
> Hi Stephen
> Thank you for your reply
>>> Support for loading the simple-card module via devicetree.
>>> It requests cpu/codec information,
>>> and .of_xlate_dai_name support on each driver for probing.
>>> diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
>>> +Optional properties:
>> ...
>>> +- simple-audio,bitclock-inversion	: bit clock inversion for both CPU/CODEC
>>> +- simple-audio,frame-inversion		: frame inversion for both CPU/CODEC
>> I think that Mark pointed out those would be best stored in the CPU and
>> CODEC child nodes, since random buffering/inverting on the board might
>> make the values at the two DAIs the opposite of each-other.
> Sub node has same properties too,
> and this is hybrid result of your/Mark comments.
> If "sound node" has these properties, these will go to both CPU/CODEC,
> this means "cpu/codec common properties"
> if "cpu/codec sub node" has it, it will go to itself only.
> I guess "common property" is useful ?

OK, that makes sense. I didn't get that impression from reading the DT
binding document though. Perhaps I read it too fast. The document should
explicitly mention which nodes those properties can exist in.

More information about the Alsa-devel mailing list