linux-kernel - Re: [PATCH 18/48] ARM: pxa: hx4700: use gpio descriptors for audio

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Date:   Thu, 5 May 2022 15:39:25 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Lubomir Rintel <lkundrak@...sk>,
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Subject: Re: [PATCH 18/48] ARM: pxa: hx4700: use gpio descriptors for audio

On Thu, May 05, 2022 at 04:33:06PM +0200, Linus Walleij wrote:
> On Thu, May 5, 2022 at 8:04 AM Arnd Bergmann <arnd@...nel.org> wrote:

> > /* Headphones jack detection DAPM pin */
> > static struct snd_soc_jack_pin hs_jack_pin[] = {
> >         {
> >                 .pin    = "Headphone Jack",
> >                 .mask   = SND_JACK_HEADPHONE,
> >         },
> >         {
> >                 .pin    = "Speaker",
> >                 /* disable speaker when hp jack is inserted */
> >                 .mask   = SND_JACK_HEADPHONE,
> >                 .invert = 1,
> >         },

> Hm some ASoC thingie. No idea what that is, but I suppose another
> place where a subsystem for legacy reasons try to do the gpiolib
> inversion on it's own accord. That one isn't flagged as active low in the
> descriptor so it's fine I guess.

It's saying that when the headphone is inserted the headphone output
should be enabled and the speaker output should be disabled, and vice
versa.

> Possible this should be fixed in ASoC to rely on gpiolib but we can't
> fix the entire world.

I don't think so.

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