linux-kernel - Re: [PATCH v1 4/6] ASoC: codecs: msm8916-wcd-analog: set default micbias voltage to 1.8

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Date:   Fri, 28 Jul 2017 15:01:19 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Banajit Goswami <bgoswami@...eaurora.org>,
        alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Patrick Lai <plai@...eaurora.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/6] ASoC: codecs: msm8916-wcd-analog: set default
 micbias voltage to 1.8

On Fri, Jul 28, 2017 at 02:54:59PM +0100, Srinivas Kandagatla wrote:
> On 28/07/17 14:40, Mark Brown wrote:
> > On Wed, Jul 26, 2017 at 02:35:10AM +0200, srinivas.kandagatla@...aro.org wrote:
> > > From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

> > > This patch sets the default internal micbias voltage to 1.8v. This
> > > default value is required for mbhc buttons to work. Also adds dt
> > > bindings to allow the board level file to specify the required default
> > > micbias value.

> > What was the default previously?

> This was set to 2.7v previously for special headsets which have high
> impedance.

So obviously this will break existing users.  That's not OK.  

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