[PATCH 1/3] ASoC: jack: Add a jack detect callback via codec

[Mark Brown]

On Mon, Apr 18, 2016 at 06:20:00PM +0800, Xing Zheng wrote:
> On 2016年04月18日 18:03, Xing Zheng wrote:

> sound {
>         ......
>         simple-audio-card,dai-link at 0 {
>             format = "i2s";
>             cpu {
>                 sound-dai = <&i2s0>;
>             };
> 
>             codec {
>                 sound-dai = <&codec>;
> 
>                 simple-audio-card,codec-jack =
>                     "JACK_HEADSET",
>                     "JACK_BTN_0",
>                     "JACK_BTN_1",
>                     "JACK_BTN_2",
>                     "JACK_BTN_3";
>             };
>         };

This seems like it's only half the job and worryingly close to Linux
internals.  In particular the fact that the binding is specific to
simple-card and the fact that it's being placed on the CODEC (rather
than a separate object that the CODEC references) so that we can't
combine multiple devices are both a concern.

Dylan Reid did have an earlier go at defining a binding for this:

  http://thread.gmane.org/gmane.linux.alsa.devel/138906

which went through a couple more iterations but the work on that seemed
to die off a bit.
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