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

[Takashi Iwai]

On Wed, 01 Feb 2017 12:47:13 +0100,
Mark Brown wrote:
> 
> 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.

How that can happen?  It applies only via DMI matching.


Takashi