[PATCH v1 1/4] ASoC: codecs: tfa989x: Add switch to allow disabling amplifier

[Mark Brown]

On Sun, Oct 24, 2021 at 10:58:37AM +0200, Vincent Knecht wrote:
> From: Stephan Gerhold <stephan at gerhold.net>
> 
> In some configurations it may be necessary to explicitly disable
> the amplifier with an ALSA mixer. An example for this is a stereo
> setup with two TFA989X. If only one of them should be used (e.g.
> to use it as an earpiece) the other one must be explicitly disabled.
> 
> Add a virtual "Amp Switch" to implement that. There is no register
> for this (SND_SOC_NOPM) so it only prevents DAPM from activating
> the amplifier. Also it is inverted (= enabled by default) for
> compatibility with devices that do not need this functionality.

Why can you not use a standard pin switch on the speaker output for
this?
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