[alsa-devel] [PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL locking

[Mark Brown]

On Fri, Aug 05, 2016 at 11:04:51AM +0200, Peter Meerwald-Stadler wrote:

> these registers cannot not found in the datasheet;
> maybe add descriptive #defines in da7213.h

> > +			snd_soc_write(codec, 0xF0, 0x8B);
> > +			snd_soc_write(codec, 0xF2, 0x03);
> > +			snd_soc_write(codec, 0xF0, 0x00);

It is very common for chips to have undocumented write sequences that
make tweaks based on test registers that are deliberately not
documented.  This looks like such a case, I'd imagine that register 0xf0
is a test key and 0xf2 contains a value being tweaked.
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