Codec without controls in device tree

[Mark Brown]

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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