[alsa-devel] [PATCH 1/2] ASoC: rt5651: Add support for external amplifier enable GPIO

[Mark Brown]

On Sun, Jun 24, 2018 at 03:02:46PM +0200, Hans de Goede wrote:
> The rt5651 does not have a built-in speaker amplifier, so it is often
> used together with an external amplifier. On some boards the external
> amplifier's enable pin is driven through a GPIO, add support for this.

This obviously shouldn't be part of the CODEC driver since it's not part
of the device, you should make a driver for GPIO controlled amplifiers
and add it to the card.  There's actually a guy I've been talking to a
bit on IRC recently who's just written one actually and will hopefully
be posting it soon.
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