[PATCH] ASoC: nau8821: Add headset button detection

[Mark Brown]

On Mon, Jun 27, 2022 at 11:29:59AM +0800, Seven Lee wrote:
> This patch adds the function of headphone button detection,
> Button detection will be enabled if the device tree
> has a key_enable property.

Is there any reason why we wouldn't support button detect - is this
device unusual in requiring some external hardware to support that or
something?
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