Codec without controls in device tree

Codec without controls in device tree

[Sascha Hauer]

Hi,

I have several i.MX8 boards here which have codecs connected to them
which are really just plane D/A converters without any control interface
like a pcm1754 or a pcm4104 in hardware mode. Currently we use the
simple-audio-card OF driver with custom codec code in sound/soc/codecs/.
The codec does nothing except specifying desired rates, channels and
formats.
Is this the way to go or is there some device tree solution to get rid
of the codec?

Sascha

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Re: Codec without controls in device tree

[Mark Brown]

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On Mon, Feb 21, 2022 at 04:05:12PM +0100, Sascha Hauer wrote:

> I have several i.MX8 boards here which have codecs connected to them
> which are really just plane D/A converters without any control interface
> like a pcm1754 or a pcm4104 in hardware mode. Currently we use the
> simple-audio-card OF driver with custom codec code in sound/soc/codecs/.
> The codec does nothing except specifying desired rates, channels and
> formats.
> Is this the way to go or is there some device tree solution to get rid
> of the codec?

That's the right way to go - the CODEC will have some constraints on
what it supports that need to be advertised, sometimes there's GPIOs for
a control interface and someone might want to hook up a clock or some
regulators.  There's several existing drivers like this.

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