[alsa-devel] [PATCH] ASoC:simple-card: Add multi-CODEC support

[Benoit Cousson]

On 10/09/2014 18:06, Jean-Francois Moine wrote:
> On Wed, 10 Sep 2014 13:43:06 +0200
> Benoit Cousson <bcousson at baylibre.com> wrote:
>
>>> +		codec at 0 {
>>> +			sound-dai = <&hdmi 0>;
>>> +		};
>>> +		codec at 1 {
>>> +			sound-dai = <&spdif_codec>;
>>>    		};
>>
>> I don't have strong opinion on that, but in my case, I was considering
>> using a simple list instead of several nodes.
>> I don't like having to add fake address just to ensure uniqueness.
>>
>> Something like that:
>>
>>    sound-dais = <&spdif_codec 1>, <&hdmi 0>;
>
> You are right, this would be simpler (I did not see that there could be
> phandle's with different cell sizes in a list).

In fact you cannot, that why I added the same number of parameters for 
both.

For DT, it is just a list of elements, it could be encoded like that:
<&spdif_codec 1 &hdmi 0>;

At the end it will be a list of u32 inside the dtb.

BTW, what is that extra parameter after the phandle? I cannot find any 
reference of that inside the Documentation.

If we need to have a random number of parameters after the code-dai 
phandle, we couldn't use that list.

>> That being said, it will require changing the name with a plural form,
>> and ensuring we have the same number of parameters for each codec.
>
> But I don't think that changing the name could be useful: the treatment
> is exactly the same and, as a result, all CODEC DAIs go to the DAI
> list of the DAI link.

Yeah, maybe not that useful, but that was just to be aligned with 
similar cases in DT bindings. Like gpios, interrupts...


Regards,
Benoit


-- 
Benoît Cousson
BayLibre
Embedded Linux Technology Lab
www.baylibre.com