linux-kernel - Re: [PATCH v2 2/2] ASoC: es7241: add es7241 codec support

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Message-ID: <20180702102021.GG18211@sirena.org.uk>
Date:   Mon, 2 Jul 2018 11:20:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ASoC: es7241: add es7241 codec support

On Mon, Jul 02, 2018 at 12:15:03PM +0200, Jerome Brunet wrote:
> On Mon, 2018-07-02 at 11:12 +0100, Mark Brown wrote:
> > On Sat, Jun 30, 2018 at 07:22:41PM +0200, Jerome Brunet wrote:

> > > +	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
> > > +	case SND_SOC_DAIFMT_I2S:
> > > +	case SND_SOC_DAIFMT_LEFT_J:
> > > +		break;

> > These two modes are not the same so either there should be some
> > different handling to select between them or one shouldn't be supported.

> Actually, the difference is provided with some pull-up/pull-down resistor.
> There no way to set this up in SW, AFAIK.
> So the driver shall accept both and trust we are not doing anything crazy

It at least needs a comment as this is obviously dodgy code.  Ideally
there'd be a DT property saying which mode was selected on a given board
so if we ever get round to doing automatic configuration of formats the
driver will be able to cope.

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