[alsa-devel] [PATCH] ASoC: rt5670: add HS ground control

[Mark Brown]

On Mon, Jan 30, 2017 at 10:58:31AM +0100, Takashi Iwai wrote:
> On Thu, 29 Dec 2016 09:23:47 +0100,

> > Some project use external circuit to prevent the headset ground noise.
> > It will need to use GPIO to control it. Dell Wyse 3040 is the only project
> > that has the external circuit so far and it uses GPIO2 for that. This patch
> > provide the support fot it.

> Mark, this seems overlooked?

No, it's complicated.  IIRC it's not *actually* doing GPIO management,
it's adding an option to wiggle a pin on the one board you've so far
that happens to have this issue but if someone finds a GPIO from
somewhere else it'll run into trouble.  But now when I go look at it
again you sent a content free ping so...
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