linux-kernel - Re: [PATCH 2/4] ASoC: tegra: Add a TDM configuration callback

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Date:   Mon, 30 Jul 2018 16:07:49 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Jorge Sanjuan <jorge.sanjuan@...ethink.co.uk>, lgirdwood@...il.com,
        thierry.reding@...il.com, alsa-devel@...a-project.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel@...ts.codethink.co.uk
Subject: Re: [PATCH 2/4] ASoC: tegra: Add a TDM configuration callback

On Mon, Jul 30, 2018 at 03:04:46PM +0100, Jon Hunter wrote:
> On 30/07/18 11:18, Mark Brown wrote:

> > DSP modes only care about the rising edge of the LRCLK, the pulse can be
> > any width without causing interoperability problems.

> OK, thanks I was not able to find a spec that defines this, but I saw a
> lot of codecs use a single bit clock width. So then equally making the
> default '1' should also be fine.

There's not really a spec for this, it's just what tends to be
implemented.

> I still do not like configuring the fsync width in this function. The
> fsync width needs to be configured for both DSP modes and normal I2S
> modes and so it seems it would be more appropriate to do this in the
> hw_params function for this driver.

You *could* just always use the I2S width, it's going to look odd when
people use a scope but it will work most of the time.

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