[alsa-devel] The best practice to tie platform DAPM widget and codec pin

[Mike Looijmans]

On 09/12/2014 06:04 AM, Anatol Pomozov wrote:
> Hi
>
> I bringing up a board that has Realtek 5677 codec. The codec has 6
> gpios and two of them are used by the board. pin3 is used to enable
> headphones amplifier. pin2 is used to gate DMIC clock for 3 of 4 DMICs
> - it allows to leave only one DMIC working in low-power mode.
>
> Now I need to configure the codec that when "Headphones" audio path is
> enabled then pin3 should go high. The same true for DMIC/pin2. I was
> looking for existing similar solutions but cannot find one.
>
> I need something similar to SND_SOC_DAPM_REGULATOR_SUPPLY that allows
> to turn on/off part of the system. But instead of manipulating a
> voltage regulator I just need to set/unset codec's gpio. What would be
> the best way to achieve it?

You can "convert" gpios to supply regulators using a "fixed" regulator 
driver (instantiated in the devicetree, or platform code on older kernels).

>
> The problem here is that codec does not know which of the outputs
> (LOUT1, LOUT2, LOUT3) corresponds to headphones. It is configured as
> audio path in *.dts file.
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-- 
Mike Looijmans