[alsa-devel] ASoC: Device tree binding to dummy codec

[jonsmirl at gmail.com]

On Mon, Jul 28, 2014 at 12:27 PM, Mark Brown <broonie at kernel.org> wrote:
> On Mon, Jul 28, 2014 at 09:49:27AM -0400, jonsmirl at gmail.com wrote:
>
>> codec: codec at 01c22c00 {
>>    compatible = "allwinner,sun7i-a20-codec";
>>    reg = <0x01c22c00 0x40>;
>>    interrupts = <0 30 4>;
>>    clocks = <&pll2 0>, <&apb0_gates 0>, <&codec_clk>;
>>    clock-names = "pll", "apb", "codec";
>>    dmas = <&dma 0 19>, <&dma 0 19>;
>>    dma-names = "rx", "tx";
>>    widgets = "Mic1 Jack", "Headphone Jack";
>>    external-amp = <&max9768>
>>    status = "okay";
>> };
>
>> If external amp is missing I just bind to my internal dummy-codec.
>
> No, the CODEC that's in the device should be there all the time - it's
> just the same as connecting an external amp to any other device,
> describe the hardware in the SoC the same way all the time and then
> connect any attached devices to it.

Allwinner has named their on-chip audio interface 'codec'. This codec
just has two FIFOs hooked to the DAC/ADC. I coded everything in the
CPU-DAI and left the CODEC-DAI empty.

So what do you want the device tree to look like?
Example with no external amp.
Example with external amp.

-- 
Jon Smirl
jonsmirl at gmail.com